feat(KAN-72): complete MCP ticket editing and discovery

app/Actions/Tickets/Support/AcceptanceCriteriaChecklistMapper.php

@@ -44,7 +44,7 @@ class AcceptanceCriteriaChecklistMapper
     /**
      * @param  array<int, array{id?: int, checked: bool, indent: int, text: string}>  $items
      */
-    public static function syncTicket(Ticket $ticket, array $items): void
+    public static function syncTicket(Ticket $ticket, array $items, bool $reuseUnidentifiedCriteria = true): void
     {
         $normalized = self::normalize($items);
         $existingCriteria = $ticket->acceptanceCriteria()->get()->keyBy('id');
@@ -73,7 +73,8 @@ class AcceptanceCriteriaChecklistMapper
                 : $existingCriteria->get($criterionId);
 
             while (
-                $criterion === null
+                $reuseUnidentifiedCriteria
+                && $criterion === null
                 && $fallbackIndex < $fallbackCriteria->count()
             ) {
                 /** @var AcceptanceCriterion $candidate */

app/Actions/Tickets/UpdateProjectTicket.php

@@ -51,6 +51,7 @@ class UpdateProjectTicket
         Ticket $ticket,
         User $actor,
         array $validated,
+        bool $replaceCriteriaWithIds = false,
     ): bool {
         $fieldValueAttributes = Arr::get($validated, 'field_values', []);
         $nextAcceptanceCriteria = AcceptanceCriteriaChecklistMapper::normalize(
@@ -58,7 +59,7 @@ class UpdateProjectTicket
         );
         $ticketAttributes = $this->buildTicketAttributes($ticket, $validated);
 
-        return DB::transaction(function () use ($actor, $fieldValueAttributes, $nextAcceptanceCriteria, $ticket, $ticketAttributes): bool {
+        return DB::transaction(function () use ($actor, $fieldValueAttributes, $nextAcceptanceCriteria, $replaceCriteriaWithIds, $ticket, $ticketAttributes): bool {
             if (! $ticketAttributes['is_blocked']) {
                 $ticketAttributes['blocked_comment'] = null;
             }
@@ -91,7 +92,9 @@ class UpdateProjectTicket
             /** @var Collection<int, TicketFieldValue> $existingFieldValues */
             $existingFieldValues = $ticket->fieldValues
                 ->keyBy('ticket_field_definition_id');
-            $currentAcceptanceCriteria = AcceptanceCriteriaChecklistMapper::fromModels($ticket->acceptanceCriteria);
+            $currentAcceptanceCriteria = $replaceCriteriaWithIds
+                ? AcceptanceCriteriaChecklistMapper::fromModelsWithIds($ticket->acceptanceCriteria)
+                : AcceptanceCriteriaChecklistMapper::fromModels($ticket->acceptanceCriteria);
 
             $changes = [];
             $summaryLabels = [];
@@ -209,7 +212,7 @@ class UpdateProjectTicket
             }
 
             if ($currentAcceptanceCriteria !== $nextAcceptanceCriteria) {
-                AcceptanceCriteriaChecklistMapper::syncTicket($ticket, $nextAcceptanceCriteria);
+                AcceptanceCriteriaChecklistMapper::syncTicket($ticket, $nextAcceptanceCriteria, ! $replaceCriteriaWithIds);
             }
 
             $fieldValueChangeSet = $this->syncProjectTicketFieldValues->handle(

app/Mcp/Servers/KanbanGitServer.php

@@ -3,11 +3,15 @@
 namespace App\Mcp\Servers;
 
 use App\Mcp\Tools\CreateTicket;
+use App\Mcp\Tools\GetProjectConfiguration;
 use App\Mcp\Tools\GetTicket;
 use App\Mcp\Tools\ListMyAssignedTickets;
+use App\Mcp\Tools\ListProjects;
 use App\Mcp\Tools\ListTicketsByStatus;
 use App\Mcp\Tools\ListTicketTypes;
 use App\Mcp\Tools\MoveTicketStatus;
+use App\Mcp\Tools\SearchTickets;
+use App\Mcp\Tools\UpdateTicket;
 use App\Mcp\Tools\UpdateTicketAssignee;
 use App\Mcp\Tools\UpdateTicketDescription;
 use Laravel\Mcp\Server;
@@ -16,8 +20,8 @@ use Laravel\Mcp\Server\Attributes\Name;
 use Laravel\Mcp\Server\Attributes\Version;
 
 #[Name('KanbanGit MCP')]
-#[Version('0.1.0')]
+#[Version('0.2.0')]
-#[Instructions('Use these tools to read, create, and update KanbanGit tickets with the authenticated application key owner permissions. Prefer stable IDs when available, especially project_id, ticket_id, ticket_type_id, and ticket_status_id. Use list_ticket_types to discover the available ticket types in a project. Use create_ticket with parent_ticket_id to create a child ticket.')]
+#[Instructions('Use these tools to read, create, and update KanbanGit tickets with the authenticated application key owner permissions. Prefer stable IDs when available, especially project_id, ticket_id, ticket_type_id, and ticket_status_id. Use list_projects and get_project_configuration for compact current project metadata. Get tickets by exact ticket_key or ticket_id, or search_tickets with pagination. Use update_ticket for partial edits; omitted fields are preserved, nullable scalar null clears, and supplied lists replace the entire list. Use move_ticket_status for allowed workflow transitions. Use list_ticket_types to discover the available ticket types in a project. Use create_ticket with parent_ticket_id to create a child ticket.')]
 class KanbanGitServer extends Server
 {
     protected array $tools = [
@@ -29,6 +33,10 @@ class KanbanGitServer extends Server
         MoveTicketStatus::class,
         CreateTicket::class,
         ListTicketTypes::class,
+        ListProjects::class,
+        GetProjectConfiguration::class,
+        SearchTickets::class,
+        UpdateTicket::class,
     ];
 
     protected array $resources = [

app/Mcp/Support/KanbanGitMcp.php

@@ -13,6 +13,7 @@ use App\Models\TicketStatus;
 use App\Models\User;
 use Illuminate\Auth\Access\AuthorizationException;
 use Illuminate\Auth\AuthenticationException;
+use Illuminate\Contracts\Pagination\LengthAwarePaginator;
 use Illuminate\Support\Collection;
 use Illuminate\Validation\ValidationException;
 use Laravel\Mcp\Request;
@@ -78,6 +79,17 @@ class KanbanGitMcp
         return $ticket;
     }
 
+    public function ticketForKey(User $user, string $ticketKey): Ticket
+    {
+        $ticket = Ticket::query()->with('project')->where('ticket_key', $ticketKey)->first();
+        if ($ticket === null || $ticket->ticket_key !== $ticketKey) {
+            throw ValidationException::withMessages(['ticket_key' => 'Ticket was not found.']);
+        }
+        $this->ensureCanRead($user, $ticket->project);
+
+        return $ticket;
+    }
+
     /**
      * @throws AuthorizationException
      */
@@ -201,6 +213,18 @@ class KanbanGitMcp
         ));
     }
 
+    /** @return array{current_page: int, per_page: int, total: int, last_page: int, has_more_pages: bool} */
+    public function paginationPayload(LengthAwarePaginator $paginator): array
+    {
+        return [
+            'current_page' => $paginator->currentPage(),
+            'per_page' => $paginator->perPage(),
+            'total' => $paginator->total(),
+            'last_page' => $paginator->lastPage(),
+            'has_more_pages' => $paginator->hasMorePages(),
+        ];
+    }
+
     /**
      * @return array<string, mixed>
      */

app/Mcp/Support/TicketUpdateInput.php

@@ -0,0 +1,108 @@
+<?php
+
+namespace App\Mcp\Support;
+
+use App\Actions\Tickets\Support\AcceptanceCriteriaChecklistMapper;
+use App\Http\Requests\UpdateProjectTicketRequest;
+use App\Models\Ticket;
+use App\Models\TicketFieldDefinition;
+use App\Models\User;
+use Illuminate\Routing\Route;
+use Illuminate\Support\Arr;
+use Illuminate\Support\Facades\Validator;
+use Illuminate\Validation\Rule;
+use Illuminate\Validation\ValidationException;
+use Laravel\Mcp\Request;
+
+class TicketUpdateInput
+{
+    public function __construct(private readonly KanbanGitMcp $kanbanGitMcp) {}
+
+    /** @return array<string, mixed> */
+    public function validate(Request $request, Ticket $ticket, User $user): array
+    {
+        $form = new UpdateProjectTicketRequest;
+        $route = new Route('PUT', '/', fn () => null);
+        $route->bind(\Illuminate\Http\Request::create('/', 'PUT'));
+        $route->setParameter('project', $ticket->project);
+        $route->setParameter('ticket', $ticket);
+        $form->setRouteResolver(fn () => $route);
+        $form->setUserResolver(fn () => $user);
+        $rules = $form->rules();
+        foreach ($rules as $key => &$rule) {
+            if (! str_contains($key, '.')) {
+                $rule = ['sometimes', ...$rule];
+            }
+        }
+        unset($rule);
+        $rules['acceptance_criteria'] = ['sometimes', 'array', 'list'];
+        $rules['acceptance_criteria.*'] = ['array:id,text,checked,indent'];
+        $rules['acceptance_criteria.*.id'] = ['sometimes', 'integer', 'min:1', 'distinct', Rule::exists('acceptance_criteria', 'id')->where('ticket_id', $ticket->id)];
+        $rules['acceptance_criteria.*.checked'] = ['sometimes', 'boolean'];
+        $rules['acceptance_criteria.*.indent'] = ['sometimes', 'integer', 'min:0', 'max:'.AcceptanceCriteriaChecklistMapper::MAX_INDENT_LEVEL];
+        $rules['field_values'] = ['sometimes', 'array', 'list'];
+        $rules['field_values.*'] = ['array:ticket_field_definition_id,value_number,value_user_id'];
+        $rules['field_values.*.ticket_field_definition_id'][] = 'distinct';
+        $rules['ticket_status_id'] = ['prohibited'];
+        $rules['acceptance_criteria.*.text'][] = function (string $attribute, mixed $value, \Closure $fail): void {
+            if (is_string($value) && trim($value) === '') {
+                $fail('Criterion text must not be blank.');
+            }
+        };
+        $input = $request->validate($rules);
+        $previousIndent = -1;
+        foreach (Arr::get($input, 'acceptance_criteria', []) as $index => $item) {
+            $indent = Arr::get($item, 'indent', 0);
+            if ($indent > $previousIndent + 1) {
+                throw ValidationException::withMessages(["acceptance_criteria.{$index}.indent" => 'Indentation cannot skip a level; the first item must have indent 0.']);
+            }
+            $previousIndent = $indent;
+        }
+        $merged = array_replace($this->kanbanGitMcp->updatePayload($ticket), $input);
+        $merged['acceptance_criteria'] = Arr::exists($input, 'acceptance_criteria')
+            ? AcceptanceCriteriaChecklistMapper::normalize($input['acceptance_criteria'])
+            : AcceptanceCriteriaChecklistMapper::fromModelsWithIds($ticket->acceptanceCriteria()->get());
+
+        $validator = Validator::make($merged, $form->rules());
+        $form->setValidator($validator);
+        $validator->validate();
+        foreach ($form->after() as $callback) {
+            $callback($validator);
+        }
+
+        $people = User::query()->visibleToProject($ticket->project)->pluck('id')->all();
+        foreach (['assignee_user_id', 'author_user_id'] as $field) {
+            if (Arr::exists($input, $field) && $input[$field] !== null && ! in_array((int) $input[$field], $people, true)) {
+                $validator->errors()->add($field, 'The person must be able to view this project.');
+            }
+        }
+        $definitions = $ticket->project->ticketFieldDefinitions()->get()->keyBy('id');
+        foreach (Arr::get($input, 'field_values', []) as $index => $value) {
+            $definition = $definitions->get($value['ticket_field_definition_id']);
+            $incompatible = $definition->field_type === 'user' ? 'value_number' : 'value_user_id';
+            if (Arr::get($value, $incompatible) !== null) {
+                $validator->errors()->add("field_values.{$index}.{$incompatible}", 'The value must match the custom field type.');
+            }
+            if (Arr::get($value, 'value_user_id') !== null && ! in_array((int) $value['value_user_id'], $people, true)) {
+                $validator->errors()->add("field_values.{$index}.value_user_id", 'The person must be able to view this project.');
+            }
+        }
+        if ($validator->errors()->isNotEmpty()) {
+            throw new ValidationException($validator);
+        }
+
+        if (Arr::exists($input, 'field_values')) {
+            $replacement = $definitions->map(fn (TicketFieldDefinition $definition): array => [
+                'ticket_field_definition_id' => $definition->id,
+                'value_number' => null,
+                'value_user_id' => null,
+            ])->all();
+            foreach ($input['field_values'] as $value) {
+                $replacement[$value['ticket_field_definition_id']] = $value;
+            }
+            $merged['field_values'] = array_values($replacement);
+        }
+
+        return $merged;
+    }
+}

app/Mcp/Tools/GetProjectConfiguration.php

@@ -0,0 +1,75 @@
+<?php
+
+namespace App\Mcp\Tools;
+
+use App\Actions\Permissions\PermissionService;
+use App\Enums\Permission;
+use App\Mcp\Support\KanbanGitMcp;
+use App\Models\TicketStatus;
+use App\Models\User;
+use Illuminate\Contracts\JsonSchema\JsonSchema;
+use Illuminate\JsonSchema\Types\Type;
+use Laravel\Mcp\Request;
+use Laravel\Mcp\Response;
+use Laravel\Mcp\ResponseFactory;
+use Laravel\Mcp\Server\Attributes\Description;
+use Laravel\Mcp\Server\Attributes\Name;
+use Laravel\Mcp\Server\Tool;
+use Laravel\Mcp\Server\Tools\Annotations\IsReadOnly;
+
+#[Name('get_project_configuration')]
+#[Description('Get compact current configuration for a visible project: ordered columns, statuses with IDs/slugs/column assignment and allowed target status IDs, types, priorities, custom field definitions, and permitted people IDs/names. Reads live effective configuration, without template snapshots or full user/project objects. People are paginated (default 25, maximum 100); use people_page for subsequent pages. Author changes require project admin permission, reported in permissions.')]
+#[IsReadOnly]
+class GetProjectConfiguration extends Tool
+{
+    public function __construct(private readonly KanbanGitMcp $kanbanGitMcp, private readonly PermissionService $permissionService) {}
+
+    public function handle(Request $request): Response|ResponseFactory
+    {
+        $input = $request->validate([
+            'project_id' => ['required', 'integer'],
+            'people_page' => ['sometimes', 'integer', 'min:1'],
+            'people_per_page' => ['sometimes', 'integer', 'min:1', 'max:100'],
+        ]);
+        $user = $this->kanbanGitMcp->user($request);
+        $project = $this->kanbanGitMcp->projectForRead($user, $input['project_id']);
+        $people = User::query()->visibleToProject($project)->orderBy('id')->paginate($input['people_per_page'] ?? 25, ['id', 'name'], 'people_page', $input['people_page'] ?? 1);
+
+        $columns = $project->boardColumns()->orderBy('id')->get(['id', 'name', 'position']);
+        $columnPositions = $columns->pluck('position', 'id');
+        $statuses = $project->ticketStatuses()->with('allowedTargetStatuses')->get()->sortBy(
+            fn (TicketStatus $status): array => [$columnPositions->get($status->board_column_id, 0), $status->position, $status->id],
+        )->values();
+
+        return Response::structured([
+            'data' => [
+                'project' => ['id' => $project->id, 'key' => $project->key, 'name' => $project->name],
+                'permissions' => [
+                    'can_write' => $this->permissionService->allows($user, Permission::ProjectWrite, $project),
+                    'can_change_author' => $this->permissionService->allows($user, Permission::ProjectAdmin, $project),
+                ],
+                'board_columns' => $columns->toArray(),
+                'ticket_statuses' => $statuses->map(fn (TicketStatus $status): array => [
+                    'id' => $status->id, 'name' => $status->name, 'slug' => $status->slug,
+                    'position' => $status->position, 'board_column_id' => $status->board_column_id,
+                    'allowed_target_status_ids' => $status->allowedTargetStatuses->pluck('id')->all(),
+                ])->all(),
+                'ticket_types' => $project->ticketTypes()->orderBy('id')->get(['id', 'name', 'position', 'is_parent'])->toArray(),
+                'ticket_priorities' => $project->ticketPriorities()->orderBy('id')->get(['id', 'name', 'position'])->toArray(),
+                'ticket_field_definitions' => $project->ticketFieldDefinitions()->orderBy('id')->get(['id', 'label', 'field_type', 'position'])->toArray(),
+                'people' => $people->getCollection()->map(fn (User $person): array => ['id' => $person->id, 'name' => $person->name])->all(),
+            ],
+            'meta' => ['people' => $this->kanbanGitMcp->paginationPayload($people)],
+        ]);
+    }
+
+    /** @return array<string, Type> */
+    public function schema(JsonSchema $schema): array
+    {
+        return [
+            'project_id' => $schema->integer()->description('Visible project ID from list_projects.')->required(),
+            'people_page' => $schema->integer()->min(1)->description('People page number, defaults to 1.'),
+            'people_per_page' => $schema->integer()->min(1)->max(100)->description('People page size, defaults to 25; maximum 100.'),
+        ];
+    }
+}

app/Mcp/Tools/GetTicket.php

@@ -14,7 +14,7 @@ use Laravel\Mcp\Server\Tool;
 use Laravel\Mcp\Server\Tools\Annotations\IsReadOnly;
 
 #[Name('get_ticket')]
-#[Description('Get a visible ticket with project, status, type, priority, assignee, author, field values, and worklog data.')]
+#[Description('Get a visible ticket by exactly one of numeric ticket_id or exact full ticket_key (e.g. KAN-67), with project, status, type, priority, assignee, author, field values, and worklog data.')]
 #[IsReadOnly]
 class GetTicket extends Tool
 {
@@ -25,11 +25,14 @@ class GetTicket extends Tool
     public function handle(Request $request): Response|ResponseFactory
     {
         $validated = $request->validate([
-            'ticket_id' => ['required', 'integer'],
+            'ticket_id' => ['required_without:ticket_key', 'prohibits:ticket_key', 'integer'],
+            'ticket_key' => ['required_without:ticket_id', 'prohibits:ticket_id', 'string', 'regex:/^[A-Z0-9]+-[1-9][0-9]*$/'],
         ]);
 
         $user = $this->kanbanGitMcp->user($request);
-        $ticket = $this->kanbanGitMcp->ticketForRead($user, (int) $validated['ticket_id']);
+        $ticket = isset($validated['ticket_id'])
+            ? $this->kanbanGitMcp->ticketForRead($user, (int) $validated['ticket_id'])
+            : $this->kanbanGitMcp->ticketForKey($user, $validated['ticket_key']);
 
         return Response::structured([
             'data' => $this->kanbanGitMcp->ticketPayload($ticket),
@@ -43,8 +46,8 @@ class GetTicket extends Tool
     {
         return [
             'ticket_id' => $schema->integer()
-                ->description('Ticket ID.')
+                ->description('Ticket ID. Supply exactly one of ticket_id or ticket_key.'),
-                ->required(),
+            'ticket_key' => $schema->string()->description('Exact full ticket key, e.g. KAN-67. Supply exactly one of ticket_id or ticket_key.'),
         ];
     }
 }

app/Mcp/Tools/ListProjects.php

@@ -0,0 +1,46 @@
+<?php
+
+namespace App\Mcp\Tools;
+
+use App\Actions\Permissions\PermissionService;
+use App\Mcp\Support\KanbanGitMcp;
+use App\Models\Project;
+use Illuminate\Contracts\JsonSchema\JsonSchema;
+use Illuminate\JsonSchema\Types\Type;
+use Laravel\Mcp\Request;
+use Laravel\Mcp\Response;
+use Laravel\Mcp\ResponseFactory;
+use Laravel\Mcp\Server\Attributes\Description;
+use Laravel\Mcp\Server\Attributes\Name;
+use Laravel\Mcp\Server\Tool;
+use Laravel\Mcp\Server\Tools\Annotations\IsReadOnly;
+
+#[Name('list_projects')]
+#[Description('List visible projects independently of assigned tickets. Returns only ID, key and name, ordered by ID, with bounded pagination. page starts at 1; per_page defaults to 25 and may not exceed 100.')]
+#[IsReadOnly]
+class ListProjects extends Tool
+{
+    public function __construct(private readonly KanbanGitMcp $kanbanGitMcp, private readonly PermissionService $permissionService) {}
+
+    public function handle(Request $request): Response|ResponseFactory
+    {
+        $input = $request->validate(['page' => ['sometimes', 'integer', 'min:1'], 'per_page' => ['sometimes', 'integer', 'min:1', 'max:100']]);
+        $user = $this->kanbanGitMcp->user($request);
+        $projects = Project::query()->whereIn('id', $this->permissionService->viewableProjectIds($user))
+            ->orderBy('id')->paginate($input['per_page'] ?? 25, ['id', 'key', 'name'], 'page', $input['page'] ?? 1);
+
+        return Response::structured([
+            'data' => $projects->getCollection()->map(fn (Project $project): array => ['id' => $project->id, 'key' => $project->key, 'name' => $project->name])->all(),
+            'meta' => $this->kanbanGitMcp->paginationPayload($projects),
+        ]);
+    }
+
+    /** @return array<string, Type> */
+    public function schema(JsonSchema $schema): array
+    {
+        return [
+            'page' => $schema->integer()->min(1)->description('Page number, defaults to 1.'),
+            'per_page' => $schema->integer()->min(1)->max(100)->description('Page size, defaults to 25; maximum 100.'),
+        ];
+    }
+}

app/Mcp/Tools/SearchTickets.php

@@ -0,0 +1,83 @@
+<?php
+
+namespace App\Mcp\Tools;
+
+use App\Actions\Permissions\PermissionService;
+use App\Mcp\Support\KanbanGitMcp;
+use App\Models\Ticket;
+use Illuminate\Contracts\JsonSchema\JsonSchema;
+use Illuminate\Database\Eloquent\Builder;
+use Illuminate\JsonSchema\Types\Type;
+use Illuminate\Support\Arr;
+use Laravel\Mcp\Request;
+use Laravel\Mcp\Response;
+use Laravel\Mcp\ResponseFactory;
+use Laravel\Mcp\Server\Attributes\Description;
+use Laravel\Mcp\Server\Attributes\Name;
+use Laravel\Mcp\Server\Tool;
+use Laravel\Mcp\Server\Tools\Annotations\IsReadOnly;
+
+#[Name('search_tickets')]
+#[Description('Search visible tickets with combined filters: exact full ticket key, literal text in title/description, project, status, type, assignee and parent. Omitted filters do not restrict results; assignee_user_id/parent_ticket_id null selects unassigned/top-level tickets. Returns compact ID, key, title, project ID and status with deterministic ID order and bounded pagination (default 25, maximum 100).')]
+#[IsReadOnly]
+class SearchTickets extends Tool
+{
+    public function __construct(private readonly KanbanGitMcp $kanbanGitMcp, private readonly PermissionService $permissionService) {}
+
+    public function handle(Request $request): Response|ResponseFactory
+    {
+        $input = $request->validate([
+            'ticket_key' => ['sometimes', 'string', 'regex:/^[A-Z0-9]+-[1-9][0-9]*$/'],
+            'query' => ['sometimes', 'string', 'max:255'],
+            'project_id' => ['sometimes', 'integer'],
+            'ticket_status_id' => ['sometimes', 'integer'],
+            'ticket_type_id' => ['sometimes', 'integer'],
+            'assignee_user_id' => ['sometimes', 'nullable', 'integer'],
+            'parent_ticket_id' => ['sometimes', 'nullable', 'integer'],
+            'page' => ['sometimes', 'integer', 'min:1'],
+            'per_page' => ['sometimes', 'integer', 'min:1', 'max:100'],
+        ]);
+        $user = $this->kanbanGitMcp->user($request);
+        $this->kanbanGitMcp->projectForRead($user, $input['project_id'] ?? null);
+        $query = Ticket::query()->whereIn('project_id', $this->permissionService->viewableProjectIds($user));
+        foreach (['ticket_key', 'project_id', 'ticket_status_id', 'ticket_type_id', 'assignee_user_id', 'parent_ticket_id'] as $filter) {
+            if (Arr::exists($input, $filter)) {
+                $query->where($filter, $input[$filter]);
+            }
+        }
+        if (Arr::exists($input, 'query')) {
+            $pattern = '%'.str_replace(['!', '%', '_'], ['!!', '!%', '!_'], $input['query']).'%';
+            $query->where(fn (Builder $q) => $q->whereRaw("title LIKE ? ESCAPE '!'", [$pattern])->orWhereRaw("description LIKE ? ESCAPE '!'", [$pattern]));
+        }
+        $tickets = $query->with('ticketStatus:id,name,slug,board_column_id')->orderBy('id')
+            ->paginate($input['per_page'] ?? 25, ['id', 'ticket_key', 'title', 'project_id', 'ticket_status_id'], 'page', $input['page'] ?? 1);
+
+        return Response::structured([
+            'data' => $tickets->getCollection()->map(fn (Ticket $ticket): array => [
+                'id' => $ticket->id,
+                'ticket_key' => $ticket->ticket_key,
+                'title' => $ticket->title,
+                'project_id' => $ticket->project_id,
+                'ticket_status_id' => $ticket->ticket_status_id,
+                'status' => $ticket->ticketStatus === null ? null : ['id' => $ticket->ticketStatus->id, 'name' => $ticket->ticketStatus->name, 'slug' => $ticket->ticketStatus->slug],
+            ])->all(),
+            'meta' => $this->kanbanGitMcp->paginationPayload($tickets),
+        ]);
+    }
+
+    /** @return array<string, Type> */
+    public function schema(JsonSchema $schema): array
+    {
+        return [
+            'ticket_key' => $schema->string()->description('Exact full key, e.g. KAN-67.'),
+            'query' => $schema->string()->max(255)->description('Literal substring in title or description.'),
+            'project_id' => $schema->integer()->description('Visible project ID.'),
+            'ticket_status_id' => $schema->integer()->description('Status ID from get_project_configuration.'),
+            'ticket_type_id' => $schema->integer()->description('Type ID from get_project_configuration.'),
+            'assignee_user_id' => $schema->integer()->nullable()->description('Assignee ID; null selects unassigned tickets.'),
+            'parent_ticket_id' => $schema->integer()->nullable()->description('Parent ID; null selects top-level tickets.'),
+            'page' => $schema->integer()->min(1)->description('Page number, defaults to 1.'),
+            'per_page' => $schema->integer()->min(1)->max(100)->description('Page size, defaults to 25; maximum 100.'),
+        ];
+    }
+}

app/Mcp/Tools/UpdateTicket.php

@@ -0,0 +1,71 @@
+<?php
+
+namespace App\Mcp\Tools;
+
+use App\Actions\Tickets\UpdateProjectTicket;
+use App\Mcp\Support\KanbanGitMcp;
+use App\Mcp\Support\TicketUpdateInput;
+use Illuminate\Contracts\JsonSchema\JsonSchema;
+use Illuminate\JsonSchema\Types\Type;
+use Laravel\Mcp\Request;
+use Laravel\Mcp\Response;
+use Laravel\Mcp\ResponseFactory;
+use Laravel\Mcp\Server\Attributes\Description;
+use Laravel\Mcp\Server\Attributes\Name;
+use Laravel\Mcp\Server\Tool;
+use Laravel\Mcp\Server\Tools\Annotations\IsDestructive;
+
+#[Name('update_ticket')]
+#[Description('Partially update a ticket by ID using existing project permissions and ticket rules. Omitted fields stay unchanged. Explicit null clears nullable scalar fields only. acceptance_criteria and field_values replace their entire lists; [] clears a list and null is rejected. Checklist items with an existing ID retain their identity; omit id for a new item. Use move_ticket_status separately for workflow transitions. Author changes require project admin permission; people must be visible to the project.')]
+#[IsDestructive(false)]
+class UpdateTicket extends Tool
+{
+    public function __construct(
+        private readonly KanbanGitMcp $kanbanGitMcp,
+        private readonly TicketUpdateInput $ticketUpdateInput,
+        private readonly UpdateProjectTicket $updateProjectTicket,
+    ) {}
+
+    public function handle(Request $request): Response|ResponseFactory
+    {
+        $selector = $request->validate(['ticket_id' => ['required', 'integer']]);
+        $user = $this->kanbanGitMcp->user($request);
+        $ticket = $this->kanbanGitMcp->ticketForWrite($user, (int) $selector['ticket_id']);
+        $validated = $this->ticketUpdateInput->validate($request, $ticket, $user);
+        $updated = $this->updateProjectTicket->handle($ticket, $user, $validated, true);
+
+        return Response::structured([
+            'data' => $this->kanbanGitMcp->ticketPayload($ticket->fresh()),
+            'meta' => ['updated' => $updated],
+        ]);
+    }
+
+    /** @return array<string, Type> */
+    public function schema(JsonSchema $schema): array
+    {
+        return [
+            'ticket_id' => $schema->integer()->description('Existing ticket ID.')->required(),
+            'title' => $schema->string()->max(255)->description('Nonblank title; omit to preserve.'),
+            'description' => $schema->string()->nullable()->description('Description; null clears it.'),
+            'ticket_type_id' => $schema->integer()->description('Type ID from get_project_configuration.'),
+            'ticket_priority_id' => $schema->integer()->description('Priority ID from get_project_configuration.'),
+            'parent_ticket_id' => $schema->integer()->nullable()->description('Parent-enabled ticket in this project; null removes the parent. Cycles are forbidden.'),
+            'assignee_user_id' => $schema->integer()->nullable()->description('Allowed person ID; null unassigns.'),
+            'author_user_id' => $schema->integer()->nullable()->description('Author ID; null clears. Changes require project admin permission.'),
+            'story_points' => $schema->integer()->min(0)->nullable()->description('Nonnegative estimate; null clears.'),
+            'is_blocked' => $schema->boolean()->description('Blocked state; true requires a nonblank blocker comment. Omit to preserve.'),
+            'blocked_comment' => $schema->string()->nullable()->description('Blocker reason; null clears only when the ticket is unblocked.'),
+            'acceptance_criteria' => $schema->array()->items($schema->object([
+                'id' => $schema->integer()->min(1)->description('Existing criterion ID belonging to this ticket. Omit for a new item. IDs must be unique.'),
+                'text' => $schema->string()->description('Nonblank criterion text.')->required(),
+                'checked' => $schema->boolean()->description('Checked state, defaults to false for supplied items.'),
+                'indent' => $schema->integer()->min(0)->max(8)->description('Indent level, defaults to 0; cannot skip a level.'),
+            ])->withoutAdditionalProperties())->description('Ordered replacement checklist. Omitted items are removed. [] clears; omit field to preserve; null is invalid.'),
+            'field_values' => $schema->array()->items($schema->object([
+                'ticket_field_definition_id' => $schema->integer()->description('Project field ID, supplied once.')->required(),
+                'value_number' => $schema->number()->nullable()->description('Value for a numeric field; null clears.'),
+                'value_user_id' => $schema->integer()->nullable()->description('Allowed person ID for a user field; null clears.'),
+            ])->withoutAdditionalProperties())->description('Replacement custom-field list. Omitted definitions are cleared. [] clears all; omit field to preserve; null is invalid.'),
+        ];
+    }
+}

tests/Feature/Mcp/TicketDiscoveryTest.php

@@ -0,0 +1,225 @@
+<?php
+
+namespace Tests\Feature\Mcp;
+
+use App\Actions\ProjectTicketMetadata\InitializeProjectTicketMetadata;
+use App\Mcp\Servers\KanbanGitServer;
+use App\Mcp\Tools\GetProjectConfiguration;
+use App\Mcp\Tools\GetTicket;
+use App\Mcp\Tools\ListProjects;
+use App\Mcp\Tools\SearchTickets;
+use App\Models\BoardColumn;
+use App\Models\Project;
+use App\Models\Team;
+use App\Models\Ticket;
+use App\Models\TicketFieldDefinition;
+use App\Models\TicketStatus;
+use App\Models\User;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Illuminate\Testing\Fluent\AssertableJson;
+use Illuminate\Testing\TestResponse;
+use PHPUnit\Framework\Attributes\DataProvider;
+use Tests\TestCase;
+
+class TicketDiscoveryTest extends TestCase
+{
+    use RefreshDatabase;
+
+    private User $user;
+
+    private Project $project;
+
+    private Project $hidden;
+
+    private Ticket $ticket;
+
+    protected function setUp(): void
+    {
+        parent::setUp();
+        $this->user = User::factory()->create();
+        $this->project = Project::factory()->create(['key' => 'CORE', 'name' => 'Visible']);
+        $this->hidden = Project::factory()->create(['key' => 'HIDE']);
+        app(InitializeProjectTicketMetadata::class)->handle($this->project);
+        app(InitializeProjectTicketMetadata::class)->handle($this->hidden);
+        $this->syncProjectPermissions($this->project, $this->user, ['view']);
+        $this->ticket = $this->newTicket($this->project, 1, ['title' => 'Special needle', 'description' => 'First description', 'assignee_user_id' => $this->user->id]);
+        $this->newTicket($this->project, 2, ['title' => 'Other title', 'description' => 'Needle in description', 'parent_ticket_id' => $this->ticket->id]);
+        $this->newTicket($this->hidden, 1, ['title' => 'Hidden needle']);
+    }
+
+    public function test_exact_key_and_existing_id_lookup_work_and_hidden_tickets_are_denied(): void
+    {
+        foreach ([['ticket_id' => $this->ticket->id], ['ticket_key' => 'CORE-1']] as $input) {
+            KanbanGitServer::actingAs($this->user)->tool(GetTicket::class, $input)->assertOk()
+                ->assertStructuredContent(fn (AssertableJson $json) => $json->where('data.ticket.id', $this->ticket->id)->etc());
+        }
+        KanbanGitServer::actingAs($this->user)->tool(GetTicket::class, ['ticket_key' => 'HIDE-1'])->assertHasErrors(['cannot view']);
+        KanbanGitServer::actingAs($this->user)->tool(GetTicket::class, ['ticket_key' => 'CORE-99'])->assertHasErrors(['not found']);
+    }
+
+    #[DataProvider('invalidSelectors')]
+    public function test_key_lookup_requires_exactly_one_valid_selector(array $input): void
+    {
+        KanbanGitServer::actingAs($this->user)->tool(GetTicket::class, $input)->assertHasErrors();
+    }
+
+    public static function invalidSelectors(): array
+    {
+        return [
+            [[]], [['ticket_key' => 'CORE']], [['ticket_key' => 'core-1']], [['ticket_key' => 'CORE-0']],
+            [['ticket_key' => 'CORE-1', 'ticket_id' => 1]], [['ticket_key' => null]],
+        ];
+    }
+
+    public function test_search_combines_filters_and_paginates_only_visible_tickets_with_compact_payloads(): void
+    {
+        KanbanGitServer::actingAs($this->user)->tool(SearchTickets::class, ['query' => 'needle', 'per_page' => 1])
+            ->assertOk()->assertStructuredContent(fn (AssertableJson $json) => $json
+            ->where('data.0.id', $this->ticket->id)->count('data', 1)
+            ->where('data.0.status.id', $this->ticket->ticket_status_id)
+            ->missing('data.0.description')->missing('data.0.project')
+            ->where('meta.total', 2)->where('meta.last_page', 2)->where('meta.has_more_pages', true)->etc());
+        KanbanGitServer::actingAs($this->user)->tool(SearchTickets::class, ['query' => 'needle', 'page' => 2, 'per_page' => 1])
+            ->assertOk()->assertStructuredContent(fn (AssertableJson $json) => $json
+            ->where('data.0.ticket_key', 'CORE-2')->where('meta.current_page', 2)->where('meta.has_more_pages', false)->etc());
+        KanbanGitServer::actingAs($this->user)->tool(SearchTickets::class, [
+            'project_id' => $this->project->id, 'ticket_key' => 'CORE-1', 'ticket_status_id' => $this->ticket->ticket_status_id,
+            'ticket_type_id' => $this->ticket->ticket_type_id, 'assignee_user_id' => $this->user->id, 'parent_ticket_id' => null,
+        ])->assertOk()->assertStructuredContent(fn (AssertableJson $json) => $json->count('data', 1)->where('data.0.id', $this->ticket->id)->etc());
+        KanbanGitServer::actingAs($this->user)->tool(SearchTickets::class, ['parent_ticket_id' => $this->ticket->id, 'assignee_user_id' => null])
+            ->assertOk()->assertStructuredContent(fn (AssertableJson $json) => $json->count('data', 1)->where('data.0.ticket_key', 'CORE-2')->etc());
+        KanbanGitServer::actingAs($this->user)->tool(SearchTickets::class, ['ticket_type_id' => $this->hidden->ticketTypes()->firstOrFail()->id])
+            ->assertOk()->assertStructuredContent(fn (AssertableJson $json) => $json->count('data', 0)->etc());
+        KanbanGitServer::actingAs($this->user)->tool(SearchTickets::class, ['project_id' => $this->hidden->id])->assertHasErrors(['cannot view']);
+        KanbanGitServer::actingAs($this->user)->tool(SearchTickets::class, ['page' => 10])->assertOk()
+            ->assertStructuredContent(fn (AssertableJson $json) => $json->count('data', 0)->where('meta.total', 2)->etc());
+    }
+
+    public function test_search_returns_tickets_without_a_status(): void
+    {
+        $this->ticket->update(['ticket_status_id' => null]);
+        KanbanGitServer::actingAs($this->user)->tool(SearchTickets::class, ['ticket_key' => 'CORE-1'])->assertOk()
+            ->assertStructuredContent(fn (AssertableJson $json) => $json->where('data.0.id', $this->ticket->id)
+                ->where('data.0.ticket_status_id', null)->where('data.0.status', null)->etc());
+    }
+
+    public function test_literal_search_does_not_expand_sql_wildcards(): void
+    {
+        $this->ticket->update(['title' => 'A 50%_! literal']);
+        KanbanGitServer::actingAs($this->user)->tool(SearchTickets::class, ['query' => '%_!'])
+            ->assertOk()->assertStructuredContent(fn (AssertableJson $json) => $json->count('data', 1)->where('data.0.id', $this->ticket->id)->etc());
+    }
+
+    public function test_project_list_is_compact_paginated_and_independent_of_assignments_with_team_and_global_access(): void
+    {
+        $this->ticket->update(['assignee_user_id' => null]);
+        KanbanGitServer::actingAs($this->user)->tool(ListProjects::class)->assertOk()
+            ->assertStructuredContent(fn (AssertableJson $json) => $json->count('data', 1)->where('data.0.key', 'CORE')->missing('data.0.template_state')->where('meta.total', 1)->etc());
+        $team = Team::factory()->create();
+        $team->users()->attach($this->user);
+        $this->syncProjectPermissions($this->hidden, $team, ['view']);
+        KanbanGitServer::actingAs($this->user)->tool(ListProjects::class, ['per_page' => 1, 'page' => 2])->assertOk()
+            ->assertStructuredContent(fn (AssertableJson $json) => $json->where('data.0.id', $this->hidden->id)->where('meta.total', 2)->etc());
+        $global = User::factory()->create();
+        $this->syncGlobalPermissions($global, ['admin']);
+        KanbanGitServer::actingAs($global)->tool(SearchTickets::class)->assertOk()
+            ->assertStructuredContent(fn (AssertableJson $json) => $json->where('meta.total', 3)->etc());
+        KanbanGitServer::actingAs(User::factory()->create())->tool(ListProjects::class)->assertOk()
+            ->assertStructuredContent(fn (AssertableJson $json) => $json->count('data', 0)->where('meta.total', 0)->etc());
+    }
+
+    public function test_configuration_returns_current_workflow_and_allowed_people_without_full_resources(): void
+    {
+        $first = $this->project->ticketStatuses()->firstOrFail();
+        $column = BoardColumn::factory()->for($this->project)->create(['position' => 1]);
+        $second = TicketStatus::factory()->for($this->project)->for($column)->create(['position' => 1]);
+        TicketFieldDefinition::factory()->for($this->project)->create(['field_type' => 'user', 'position' => 1]);
+        $first->allowedTargetStatuses()->sync([$second->id]);
+        $first->update(['name' => 'Fresh workflow']);
+        $otherViewer = User::factory()->create();
+        $this->syncProjectPermissions($this->project, $otherViewer, ['view']);
+        User::factory()->create();
+        KanbanGitServer::actingAs($this->user)->tool(GetProjectConfiguration::class, ['project_id' => $this->project->id, 'people_per_page' => 1])
+            ->assertOk()->assertStructuredContent(fn (AssertableJson $json) => $json
+            ->where('data.project.id', $this->project->id)->missing('data.project.template_state')
+            ->where('data.permissions.can_write', false)->where('data.permissions.can_change_author', false)
+            ->where('data.ticket_statuses.0.id', $first->id)->where('data.ticket_statuses.0.slug', 'fresh-workflow')
+            ->where('data.ticket_statuses.0.allowed_target_status_ids', [$second->id])
+            ->where('data.ticket_statuses.0.board_column_id', $first->board_column_id)
+            ->has('data.ticket_field_definitions.0.field_type')->has('data.ticket_types.0.is_parent')->has('data.ticket_priorities.0.id')->has('data.board_columns.0.position')
+            ->count('data.people', 1)->missing('data.people.0.email')->missing('data.people.0.avatar')
+            ->where('meta.people.total', 2)->etc());
+        KanbanGitServer::actingAs($this->user)->tool(GetProjectConfiguration::class, ['project_id' => $this->project->id, 'people_page' => 2, 'people_per_page' => 1])
+            ->assertOk()->assertStructuredContent(fn (AssertableJson $json) => $json->where('data.people.0.id', $otherViewer->id)->etc());
+        KanbanGitServer::actingAs($this->user)->tool(GetProjectConfiguration::class, ['project_id' => $this->hidden->id])->assertHasErrors(['cannot view']);
+    }
+
+    public function test_numeric_project_keys_and_configured_column_order_are_supported(): void
+    {
+        $this->project->update(['key' => '42']);
+        $this->ticket->update(['ticket_key' => '42-1']);
+        KanbanGitServer::actingAs($this->user)->tool(GetTicket::class, ['ticket_key' => '42-1'])->assertOk();
+        KanbanGitServer::actingAs($this->user)->tool(SearchTickets::class, ['ticket_key' => '42-1'])->assertOk()
+            ->assertStructuredContent(fn (AssertableJson $json) => $json->where('data.0.id', $this->ticket->id)->etc());
+        $later = BoardColumn::factory()->for($this->project)->create(['position' => 2]);
+        $earlier = BoardColumn::factory()->for($this->project)->create(['position' => 1]);
+        $laterStatus = TicketStatus::factory()->for($this->project)->for($later)->create(['position' => 1]);
+        $earlierStatus = TicketStatus::factory()->for($this->project)->for($earlier)->create(['position' => 1]);
+        KanbanGitServer::actingAs($this->user)->tool(GetProjectConfiguration::class, ['project_id' => $this->project->id])->assertOk()
+            ->assertStructuredContent(fn (AssertableJson $json) => $json
+                ->where('data.board_columns.0.id', $earlier->id)
+                ->where('data.ticket_statuses.1.id', $earlierStatus->id)
+                ->where('data.ticket_statuses.2.id', $laterStatus->id)->etc());
+    }
+
+    public function test_pagination_limits_and_missing_projects_are_validated(): void
+    {
+        foreach ([ListProjects::class, SearchTickets::class] as $tool) {
+            KanbanGitServer::actingAs($this->user)->tool($tool, ['per_page' => 101])->assertHasErrors();
+            KanbanGitServer::actingAs($this->user)->tool($tool, ['page' => 0])->assertHasErrors();
+        }
+        KanbanGitServer::actingAs($this->user)->tool(GetProjectConfiguration::class, ['project_id' => 999])->assertHasErrors(['not found']);
+        KanbanGitServer::actingAs($this->user)->tool(GetProjectConfiguration::class, ['project_id' => $this->project->id, 'people_per_page' => 101])->assertHasErrors();
+    }
+
+    public function test_application_key_discovers_new_schemas_and_completes_refinement_without_browser_login(): void
+    {
+        $this->syncProjectPermissions($this->project, $this->user, ['write']);
+        $this->withApplicationKey($this->user);
+        $response = $this->postJson('/mcp/kanbangit', ['jsonrpc' => '2.0', 'id' => 1, 'method' => 'tools/list', 'params' => []])->assertOk();
+        $tools = collect($response->json('result.tools'))->keyBy('name');
+        foreach (['list_projects', 'search_tickets', 'get_project_configuration'] as $name) {
+            $this->assertTrue($tools[$name]['annotations']['readOnlyHint']);
+        }
+        $this->assertSame(['ticket_id'], $tools['update_ticket']['inputSchema']['required']);
+        $this->assertArrayHasKey('ticket_key', $tools['get_ticket']['inputSchema']['properties']);
+        $this->assertFalse($tools['update_ticket']['annotations']['destructiveHint']);
+        $this->rpc('update_ticket', ['ticket_id' => $this->ticket->id, 'title' => 'Refined via MCP', 'description' => 'Refinement', 'acceptance_criteria' => [['text' => 'Real criterion']]]);
+        $ticket = $this->rpc('get_ticket', ['ticket_key' => 'CORE-1'])->json('result.structuredContent.data.ticket');
+        $this->assertSame('Refined via MCP', $ticket['title']);
+        $this->assertSame('Real criterion', $ticket['acceptance_criteria'][0]['text']);
+        $this->rpc('update_ticket', ['ticket_id' => $this->ticket->id, 'acceptance_criteria' => [['id' => $ticket['acceptance_criteria'][0]['id'], 'text' => 'Criterion checked', 'checked' => true]]]);
+        $target = TicketStatus::factory()->for($this->project)->create(['position' => 2]);
+        $this->ticket->ticketStatus->allowedTargetStatuses()->sync([$target->id]);
+        $this->rpc('move_ticket_status', ['ticket_id' => $this->ticket->id, 'ticket_status_id' => $target->id]);
+        $this->assertSame($target->id, $this->ticket->fresh()->ticket_status_id);
+    }
+
+    private function rpc(string $name, array $arguments): TestResponse
+    {
+        return $this->postJson('/mcp/kanbangit', [
+            'jsonrpc' => '2.0', 'id' => 2, 'method' => 'tools/call', 'params' => ['name' => $name, 'arguments' => $arguments],
+        ])->assertOk()->assertJsonPath('result.isError', false);
+    }
+
+    private function newTicket(Project $project, int $sequence, array $attributes = []): Ticket
+    {
+        return Ticket::factory()->create([
+            'project_id' => $project->id, 'ticket_key' => "{$project->key}-{$sequence}", 'sequence_number' => $sequence,
+            'ticket_status_id' => $project->ticketStatuses()->firstOrFail()->id,
+            'ticket_type_id' => $project->ticketTypes()->where('is_parent', $sequence === 1)->firstOrFail()->id,
+            'ticket_priority_id' => $project->ticketPriorities()->firstOrFail()->id,
+            ...$attributes,
+        ]);
+    }
+}

tests/Feature/Mcp/UpdateTicketTest.php

@@ -0,0 +1,235 @@
+<?php
+
+namespace Tests\Feature\Mcp;
+
+use App\Actions\ProjectTicketMetadata\InitializeProjectTicketMetadata;
+use App\Actions\Tickets\Support\AcceptanceCriteriaChecklistMapper;
+use App\Actions\Tickets\SyncProjectTicketFieldValues;
+use App\Mcp\Servers\KanbanGitServer;
+use App\Mcp\Tools\GetTicket;
+use App\Mcp\Tools\UpdateTicket;
+use App\Models\Project;
+use App\Models\Ticket;
+use App\Models\TicketFieldDefinition;
+use App\Models\TicketPriority;
+use App\Models\User;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Illuminate\Testing\Fluent\AssertableJson;
+use Laravel\Mcp\Server\Testing\TestResponse;
+use PHPUnit\Framework\Attributes\DataProvider;
+use RuntimeException;
+use Tests\TestCase;
+
+class UpdateTicketTest extends TestCase
+{
+    use RefreshDatabase;
+
+    private User $user;
+
+    private Project $project;
+
+    private Ticket $ticket;
+
+    protected function setUp(): void
+    {
+        parent::setUp();
+        $this->user = User::factory()->create();
+        $this->project = Project::factory()->create(['key' => 'CORE']);
+        app(InitializeProjectTicketMetadata::class)->handle($this->project);
+        $this->syncProjectPermissions($this->project, $this->user, ['admin']);
+        $this->ticket = $this->newTicket(['description' => 'Original', 'story_points' => 5, 'author_user_id' => $this->user->id]);
+        AcceptanceCriteriaChecklistMapper::syncTicket($this->ticket, [
+            ['text' => 'First', 'checked' => false, 'indent' => 0],
+            ['text' => 'Second', 'checked' => true, 'indent' => 0],
+        ]);
+    }
+
+    public function test_partial_update_and_no_op_preserve_checklist_ids_and_unrelated_fields(): void
+    {
+        $before = AcceptanceCriteriaChecklistMapper::fromModelsWithIds($this->ticket->acceptanceCriteria()->get());
+        $this->updateTicket(['title' => 'Refined'])->assertOk()->assertStructuredContent(fn (AssertableJson $json) => $json
+            ->where('data.ticket.description', 'Original')->where('data.ticket.story_points', 5)
+            ->where('data.ticket.acceptance_criteria', $before)->where('meta.updated', true)->etc());
+        $this->updateTicket(['title' => 'Refined'])->assertOk()->assertStructuredContent(fn (AssertableJson $json) => $json->where('meta.updated', false)->etc());
+        $this->assertSame(1, $this->ticket->worklogEntries()->count());
+        $this->assertSame('Refined', $this->ticket->fresh()->title);
+    }
+
+    public function test_checklist_replacement_adds_reorders_indents_checks_and_removes_by_identity(): void
+    {
+        $before = AcceptanceCriteriaChecklistMapper::fromModelsWithIds($this->ticket->acceptanceCriteria()->get());
+        $replacement = [
+            ['text' => 'New root', 'checked' => false, 'indent' => 0],
+            ['id' => $before[1]['id'], 'text' => 'Second edited', 'checked' => false, 'indent' => 1],
+            ['id' => $before[0]['id'], 'text' => 'First', 'checked' => true, 'indent' => 0],
+        ];
+        $this->updateTicket(['acceptance_criteria' => $replacement])->assertOk();
+        $after = AcceptanceCriteriaChecklistMapper::fromModelsWithIds($this->ticket->acceptanceCriteria()->get());
+        $this->assertNotContains($after[0]['id'], array_column($before, 'id'));
+        $this->assertSame($replacement[1], ['id' => $after[1]['id'], 'text' => $after[1]['text'], 'checked' => $after[1]['checked'], 'indent' => $after[1]['indent']]);
+        $this->assertSame($before[0]['id'], $after[2]['id']);
+        $this->updateTicket(['acceptance_criteria' => $after])->assertOk()->assertStructuredContent(fn (AssertableJson $json) => $json->where('meta.updated', false)->etc());
+        $this->updateTicket(['acceptance_criteria' => [$after[2]]])->assertOk();
+        KanbanGitServer::actingAs($this->user)->tool(GetTicket::class, ['ticket_key' => 'CORE-1'])
+            ->assertOk()->assertStructuredContent(fn (AssertableJson $json) => $json->count('data.ticket.acceptance_criteria', 1)->where('data.ticket.acceptance_criteria.0.id', $before[0]['id'])->etc());
+        $this->updateTicket(['acceptance_criteria' => []])->assertOk();
+        $this->assertSame(0, $this->ticket->acceptanceCriteria()->count());
+    }
+
+    public function test_scalar_null_and_custom_field_replacement_have_explicit_clear_semantics(): void
+    {
+        $number = TicketFieldDefinition::factory()->for($this->project)->create(['field_type' => 'number']);
+        $person = TicketFieldDefinition::factory()->for($this->project)->create(['field_type' => 'user', 'position' => 2]);
+        $this->updateTicket(['field_values' => [
+            ['ticket_field_definition_id' => $number->id, 'value_number' => 0],
+            ['ticket_field_definition_id' => $person->id, 'value_user_id' => $this->user->id],
+        ]])->assertOk();
+        $this->updateTicket(['description' => null, 'story_points' => null, 'assignee_user_id' => null, 'author_user_id' => null])->assertOk();
+        $this->assertSame(2, $this->ticket->fieldValues()->count());
+        $this->assertNull($this->ticket->fresh()->description);
+        $this->assertNull($this->ticket->fresh()->story_points);
+        $this->updateTicket(['field_values' => [['ticket_field_definition_id' => $number->id, 'value_number' => 3]]])->assertOk();
+        $this->assertSame(1, $this->ticket->fieldValues()->count());
+        $this->updateTicket(['field_values' => []])->assertOk();
+        $this->assertSame(0, $this->ticket->fieldValues()->count());
+    }
+
+    #[DataProvider('invalidInputs')]
+    public function test_invalid_payload_does_not_partially_change_ticket(array $input): void
+    {
+        $before = $this->ticket->fresh()->getAttributes();
+        $this->updateTicket(['title' => 'Must not change', ...$input])->assertHasErrors();
+        $this->assertSame($before, $this->ticket->fresh()->getAttributes());
+        $this->assertSame(0, $this->ticket->worklogEntries()->count());
+        $this->assertSame(2, $this->ticket->acceptanceCriteria()->count());
+    }
+
+    public static function invalidInputs(): array
+    {
+        return [
+            'null title' => [['title' => null]],
+            'null type' => [['ticket_type_id' => null]],
+            'null priority' => [['ticket_priority_id' => null]],
+            'null blocked state' => [['is_blocked' => null]],
+            'invalid criterion text' => [['acceptance_criteria' => [['text' => []]]]],
+            'null criteria' => [['acceptance_criteria' => null]],
+            'null fields' => [['field_values' => null]],
+            'invalid criterion' => [['acceptance_criteria' => [['id' => 99999, 'text' => 'Foreign']]]],
+            'blank criterion' => [['acceptance_criteria' => [['text' => '   ']]]],
+            'skipped indent' => [['acceptance_criteria' => [['text' => 'Child', 'indent' => 1]]]],
+            'negative points' => [['story_points' => -1]],
+            'missing blocker' => [['is_blocked' => true]],
+            'status not editable' => [['ticket_status_id' => 999]],
+        ];
+    }
+
+    public function test_foreign_and_duplicate_criterion_ids_are_rejected_atomically(): void
+    {
+        $other = $this->newTicket(['ticket_key' => 'CORE-2', 'sequence_number' => 2]);
+        AcceptanceCriteriaChecklistMapper::syncTicket($other, [['text' => 'Other', 'checked' => false, 'indent' => 0]]);
+        $foreign = $other->acceptanceCriteria()->firstOrFail()->id;
+        $this->updateTicket(['title' => 'Rejected', 'acceptance_criteria' => [['id' => $foreign, 'text' => 'Steal']]])->assertHasErrors();
+        $id = $this->ticket->acceptanceCriteria()->firstOrFail()->id;
+        $this->updateTicket(['acceptance_criteria' => [['id' => $id, 'text' => 'One'], ['id' => $id, 'text' => 'Two']]])->assertHasErrors();
+        $this->assertSame('Original', $this->ticket->fresh()->description);
+        $this->assertSame('Other', $other->acceptanceCriteria()->firstOrFail()->text);
+    }
+
+    public function test_project_read_and_write_permissions_and_author_rules_are_enforced(): void
+    {
+        $this->syncProjectPermissions($this->project, $this->user, ['view']);
+        $this->updateTicket(['title' => 'Denied'])->assertHasErrors(['cannot update tickets']);
+        $this->syncProjectPermissions($this->project, $this->user, ['write']);
+        $this->updateTicket(['title' => 'Allowed'])->assertOk();
+        $this->updateTicket(['author_user_id' => null])->assertHasErrors(['Only project admins']);
+        $this->syncProjectPermissions($this->project, $this->user, []);
+        $this->updateTicket(['title' => 'Denied'])->assertHasErrors(['cannot update tickets']);
+        $this->assertSame('Allowed', $this->ticket->fresh()->title);
+    }
+
+    public function test_invalid_people_foreign_metadata_custom_types_and_parent_relations_are_rejected(): void
+    {
+        $hiddenUser = User::factory()->create();
+        $this->updateTicket(['assignee_user_id' => $hiddenUser->id])->assertHasErrors(['person']);
+        $this->updateTicket(['author_user_id' => $hiddenUser->id])->assertHasErrors(['person']);
+        $otherProject = Project::factory()->create();
+        app(InitializeProjectTicketMetadata::class)->handle($otherProject);
+        $this->updateTicket(['ticket_type_id' => $otherProject->ticketTypes()->firstOrFail()->id])->assertHasErrors();
+        $this->updateTicket(['ticket_priority_id' => $otherProject->ticketPriorities()->firstOrFail()->id])->assertHasErrors();
+        $foreignTicket = Ticket::factory()->for($otherProject)->create();
+        $this->updateTicket(['parent_ticket_id' => $foreignTicket->id])->assertHasErrors();
+        $field = TicketFieldDefinition::factory()->for($this->project)->create(['field_type' => 'user']);
+        $this->updateTicket(['field_values' => [['ticket_field_definition_id' => $field->id, 'value_user_id' => $hiddenUser->id]]])->assertHasErrors(['person']);
+        $this->updateTicket(['field_values' => [['ticket_field_definition_id' => $field->id, 'value_number' => 2]]])->assertHasErrors(['field type']);
+        $this->updateTicket(['parent_ticket_id' => $this->ticket->id])->assertHasErrors(['own parent']);
+        $task = $this->newTicket(['ticket_key' => 'CORE-2', 'sequence_number' => 2]);
+        $this->updateTicket(['parent_ticket_id' => $task->id])->assertHasErrors(['parent-enabled']);
+        $parentType = $this->project->ticketTypes()->where('is_parent', true)->firstOrFail();
+        $this->updateTicket(['ticket_type_id' => $parentType->id])->assertOk();
+        $task->update(['parent_ticket_id' => $this->ticket->id, 'ticket_type_id' => $parentType->id]);
+        $this->updateTicket(['parent_ticket_id' => $task->id])->assertHasErrors(['descendants']);
+        $this->updateTicket(['ticket_type_id' => $this->project->ticketTypes()->where('is_parent', false)->firstOrFail()->id])->assertHasErrors(['child tickets']);
+    }
+
+    public function test_all_editable_scalar_fields_accept_valid_project_values(): void
+    {
+        $person = User::factory()->create();
+        $this->syncProjectPermissions($this->project, $person, ['view']);
+        $parentType = $this->project->ticketTypes()->where('is_parent', true)->firstOrFail();
+        $parent = $this->newTicket(['ticket_key' => 'CORE-2', 'sequence_number' => 2, 'ticket_type_id' => $parentType->id]);
+        $priority = TicketPriority::factory()->for($this->project)->create(['position' => 2]);
+        $input = [
+            'title' => 'All scalar fields', 'description' => 'Updated description',
+            'ticket_type_id' => $parentType->id, 'ticket_priority_id' => $priority->id,
+            'assignee_user_id' => $person->id, 'author_user_id' => $person->id,
+            'parent_ticket_id' => $parent->id, 'story_points' => 0,
+            'is_blocked' => true, 'blocked_comment' => 'Dependency',
+        ];
+        $this->updateTicket($input)->assertOk();
+        foreach ($input as $field => $value) {
+            $this->assertSame($value, $this->ticket->fresh()->getAttribute($field));
+        }
+        $this->assertSame(1, $this->ticket->worklogEntries()->count());
+        $this->updateTicket(['parent_ticket_id' => null])->assertOk();
+        $this->assertNull($this->ticket->fresh()->parent_ticket_id);
+    }
+
+    public function test_blocker_validation_uses_preserved_state(): void
+    {
+        $this->updateTicket(['is_blocked' => true, 'blocked_comment' => 'Waiting'])->assertOk();
+        $this->updateTicket(['title' => 'Still blocked'])->assertOk();
+        $this->updateTicket(['blocked_comment' => null])->assertHasErrors(['blocker comment']);
+        $this->updateTicket(['is_blocked' => false])->assertOk();
+        $this->assertNull($this->ticket->fresh()->blocked_comment);
+    }
+
+    public function test_action_failure_rolls_back_scalars_checklist_and_worklog(): void
+    {
+        $this->mock(SyncProjectTicketFieldValues::class)->shouldReceive('handle')->once()->andThrow(new RuntimeException('Sync failed'));
+        try {
+            $this->updateTicket(['title' => 'Rollback', 'acceptance_criteria' => []]);
+            $this->fail('Expected action failure.');
+        } catch (RuntimeException $exception) {
+            $this->assertSame('Sync failed', $exception->getMessage());
+        }
+        $this->assertNotSame('Rollback', $this->ticket->fresh()->title);
+        $this->assertSame(2, $this->ticket->acceptanceCriteria()->count());
+        $this->assertSame(0, $this->ticket->worklogEntries()->count());
+    }
+
+    private function updateTicket(array $input): TestResponse
+    {
+        return KanbanGitServer::actingAs($this->user)->tool(UpdateTicket::class, ['ticket_id' => $this->ticket->id, ...$input]);
+    }
+
+    private function newTicket(array $attributes = []): Ticket
+    {
+        return Ticket::factory()->create([
+            'project_id' => $this->project->id, 'ticket_key' => 'CORE-1', 'sequence_number' => 1,
+            'ticket_status_id' => $this->project->ticketStatuses()->firstOrFail()->id,
+            'ticket_type_id' => $this->project->ticketTypes()->where('is_parent', false)->firstOrFail()->id,
+            'ticket_priority_id' => $this->project->ticketPriorities()->firstOrFail()->id,
+            ...$attributes,
+        ]);
+    }
+}