> ## Documentation Index > Fetch the complete documentation index at: https://docs.gc.ai/llms.txt > Use this file to discover all available pages before exploring further. # Get a Check > Retrieve a single check in a playbook by ID. Readable by any caller who can read the playbook. ## OpenAPI ````yaml GET /playbooks/{id}/checks/{checkId} openapi: 3.0.3 info: title: GC AI External API version: 1.0.0 description: >- The GC AI External API allows programmatic access to GC AI's chat capabilities. It's designed for integration with workflow automation tools like Zapier, Make, n8n, or custom applications. ## Authentication All API requests must include an API key in the `Authorization` header: ``` Authorization: gcai_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx ``` API keys can be created in the GC AI app under **Settings → API**. ## Multi-turn Conversations Conversations can span multiple turns: pass the `chat_id` returned by a completion back on your next request to continue the same chat. See [Multi-turn Conversations](/api-reference/concepts/multi-turn). ## Current Limitations The following is not yet available via API: - **Interactive clarification**: the model cannot pause to ask the caller a follow-up question; the `askUserQuestions` tool is disabled on the API surface ## Usage Usage is tracked and viewable in the GC AI app under **Settings → API → View Usage**. ## Support For API support, contact [support@gc.ai](mailto:support@gc.ai) or reach out to your account representative. contact: email: support@gc.ai servers: - url: https://app.gc.ai/api/external/v1 description: Production server security: [] tags: - name: Async Jobs description: Poll the status and result of asynchronous API jobs - name: Chat description: AI chat completion endpoints - name: Files description: File upload and management endpoints - name: Folders description: Folder management endpoints - name: Playbooks description: Playbook review endpoints - name: Profiles description: Personal and company profile endpoints - name: Projects description: Project management endpoints - name: Skills description: Skill library management endpoints - name: Utility description: Health check and connectivity endpoints - name: Usage description: Usage and credit/billing reporting endpoints paths: /playbooks/{id}/checks/{checkId}: get: tags: - Playbooks summary: Get a check description: |- Retrieve a single check in a playbook by ID. Readable by any caller who can read the playbook. operationId: getPlaybookCheck parameters: - schema: type: string format: uuid description: Playbook ID from `GET /playbooks`. required: true description: Playbook ID from `GET /playbooks`. name: id in: path - schema: type: string format: uuid description: Check ID from `GET /playbooks/{id}/checks`. required: true description: Check ID from `GET /playbooks/{id}/checks`. name: checkId in: path responses: '200': description: Check details content: application/json: schema: $ref: '#/components/schemas/PlaybookCheck' '401': description: Missing or malformed API key content: application/json: schema: $ref: '#/components/schemas/Error' '403': description: Invalid API key content: application/json: schema: $ref: '#/components/schemas/Error' '404': description: Playbook or check not found, or not accessible content: application/json: schema: $ref: '#/components/schemas/Error' '429': description: >- Rate limit exceeded. See [Rate Limits](/api-reference/concepts/rate-limits) for the tiers, limits, and how to back off. headers: Retry-After: schema: type: string description: Seconds to wait before retrying after a rate-limit block. example: '60' required: true description: Seconds to wait before retrying after a rate-limit block. RateLimit-Limit: schema: type: string description: Request quota for the applicable window. example: '3' required: true description: Request quota for the applicable window. RateLimit-Remaining: schema: type: string description: Requests remaining in the current window. example: '0' required: true description: Requests remaining in the current window. RateLimit-Reset: schema: type: string description: Seconds until the quota resets. example: '60' required: true description: Seconds until the quota resets. content: application/json: schema: $ref: '#/components/schemas/Error' '500': description: Internal server error content: application/json: schema: $ref: '#/components/schemas/Error' '503': description: Service temporarily unavailable headers: Retry-After: schema: type: string description: >- Seconds to wait before retrying after a transient service outage. example: '5' required: true description: >- Seconds to wait before retrying after a transient service outage. content: application/json: schema: $ref: '#/components/schemas/Error' security: - ApiKeyAuth: [] components: schemas: PlaybookCheck: type: object properties: id: type: string format: uuid description: Unique check identifier title: type: string description: Check title description: type: string nullable: true description: Optional internal description, or null if unset importance: type: string nullable: true enum: - low - medium - high - null description: Priority of this check within the playbook, or null if unset positions: type: array items: $ref: '#/components/schemas/PlaybookCheckPosition' description: 'The check''s positions: one standard stance plus any fallbacks.' created_at: type: string nullable: true description: ISO 8601 creation timestamp updated_at: type: string nullable: true description: ISO 8601 last-update timestamp required: - id - title - description - importance - positions - created_at - updated_at Error: type: object properties: error: type: string description: Error message code: type: string description: >- Machine-readable error code present on some errors (e.g. `RATE_LIMITED`, `INSUFFICIENT_CREDITS`, `TRIAL_NOT_STARTED`, `BILLING_NOT_CONFIGURED`). Branch on this rather than the human-readable `error` string. message: type: string description: Additional error details details: type: object additionalProperties: nullable: true description: Validation error details (for 400 errors) required: - error PlaybookCheckPosition: type: object properties: type: type: string enum: - standard - fallback description: >- The primary stance (`standard`) or an alternative fallback the reviewer may accept (`fallback`). Each check has exactly one standard position. guidance: type: string nullable: true description: >- The review stance for this position: what to require, accept, or flag. May be null for positions authored in the web app without guidance. required: - type - guidance securitySchemes: ApiKeyAuth: type: apiKey in: header name: Authorization description: |- API key for authentication. Format: `gcai_xxxxxxxxx` Create API keys in the GC AI app under Settings → API. ````