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OpenAPI Specification

openapi: 3.2.0
info:
  title: Coasty Public keys Sessions API
  version: 1.0.0
  summary: Computer Use Agents, scheduled automation, and managed VMs.
  description: "# Coasty Public API\n\nCoasty is a Computer Use Agent (CUA) platform: predict actions from screenshots,\nprovision managed VMs, and run scheduled automation against them.\n\n## Authentication\n\nAll endpoints (except `/v1/triggers/webhook/{webhook_id}` and health checks) require an API key.\nPass it as either:\n\n- `X-API-Key: sk-coasty-live-...` (or `sk-coasty-test-...` for sandbox)\n- `Authorization: Bearer sk-coasty-live-...`\n\nThe external webhook endpoint does not use an API key, but it is authenticated:\nsend the HMAC-SHA256 `Coasty-Signature` credential documented on that operation.\n\nTest-mode keys (`sk-coasty-test-*`) hit the same validation paths as live keys but\nreturn mock VMs / mock action results and never bill credits — ideal for CI.\n\n## Pricing & budgeting\n\nPer-call rates (subject to change — see `lib/pricing/tiers.ts METERED_RATES`):\n\n| Endpoint | Credits |\n|---|---|\n| `POST /v1/predict` | ~5 |\n| `POST /v1/sessions` | 10 |\n| `POST /v1/sessions/{id}/predict` | ~4 |\n| `POST /v1/ground` | ~3 |\n| `POST /v1/parse` | 0 (free) |\n\nLong-running CUA jobs orchestrated through the dashboard (not this API) bill at\n10 credits/minute with a 20-credit minimum. Subscription tiers (`free | starter |\nprofessional | enterprise`) gate feature availability (e.g. custom system prompts),\nschedule counts, and the maximum trajectory length.\n\n## Errors\n\nEvery error response uses the same envelope:\n\n```json\n{\n  \"error\": {\n    \"code\": \"INSUFFICIENT_CREDITS\",\n    \"message\": \"Need 5, have 2.\",\n    \"type\": \"billing_error\",\n    \"request_id\": \"req_a1b2c3d4e5f6\",\n    \"retryable\": false,\n    \"retry_with_same_idempotency_key\": false\n  }\n}\n```\n\nInclude the `request_id` in support requests.\n\n## Idempotency\n\nOperations marked `x-idempotency: reserve-and-replay` accept `Idempotency-Key:\n<≤128 chars of [A-Za-z0-9_-:]>`. Replays\nof the same key + identical body return the original response (with\n`X-Coasty-Idempotent-Replay: true`) for 24 h. Reusing the key with a different body\nis a 422 `IDEMPOTENCY_KEY_REUSED`.\nOperations marked `x-idempotency: webhook-payload-dedup` instead deduplicate the\nsame webhook id + identical raw body for 60 seconds; they do not accept an\nIdempotency-Key.\n\n## Clients & MCP\n\nUse the HTTP API directly from any language. Official TypeScript and Python SDKs\nare not currently published; generate a client from this OpenAPI document if needed.\n- MCP server: `npx -y @coasty/mcp` (see `x-mcp-server`)\n\n## Reference\n\nComplete (machine-readable) spec is hosted at `/.well-known/openapi.json` and\n`/openapi.json` (Stripe / Vercel conventions)."
  contact:
    name: Coasty Developer Support
    url: https://coasty.ai/support
    email: founders@coasty.ai
  license:
    name: MIT
    identifier: MIT
  termsOfService: https://coasty.ai/terms
servers:
- url: https://coasty.ai
  description: Production
- url: https://coasty.ai
  description: Sandbox — use sk-coasty-test-* keys against the same host. No billing, mock VMs.
security:
- apiKey: []
- bearerAuth: []
tags:
- name: sessions
  description: Stateful CUA sessions with persistent trajectory.
paths:
  /v1/sessions:
    post:
      tags:
      - sessions
      operationId: createSession
      summary: Create a stateful CUA session
      description: Persistent session with a 2-hour (7200s) idle TTL, reset on each predict/reset; expires_at is returned. A predict/reset against an expired or unknown session is a 404 SESSION_NOT_FOUND. Maintains trajectory across predictions. Concurrent-session limits are tier- and deployment-configured; clients must handle 429 responses instead of hardcoding a tier limit.
      security:
      - apiKey: []
      - bearerAuth: []
      parameters:
      - $ref: '#/components/parameters/IdempotencyKey'
      - $ref: '#/components/parameters/XLLMProvider'
      - $ref: '#/components/parameters/XLLMApiKey'
      - $ref: '#/components/parameters/XLLMModel'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/CreateSessionRequest'
      responses:
        '200':
          description: Session created.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/CreateSessionResponse'
          headers:
            X-Coasty-Request-Id:
              $ref: '#/components/headers/CoastyRequestId'
            X-Coasty-Key-Kind:
              $ref: '#/components/headers/KeyKind'
            X-Coasty-Test-Mode:
              $ref: '#/components/headers/TestMode'
            X-Credits-Charged:
              $ref: '#/components/headers/CreditsCharged'
            X-Credits-Remaining:
              $ref: '#/components/headers/CreditsRemaining'
            X-RateLimit-Limit:
              $ref: '#/components/headers/RateLimit'
            X-RateLimit-Remaining:
              $ref: '#/components/headers/RateRemaining'
            X-RateLimit-Reset:
              $ref: '#/components/headers/RateReset'
            RateLimit-Limit:
              $ref: '#/components/headers/RateLimit'
            RateLimit-Remaining:
              $ref: '#/components/headers/RateRemaining'
            RateLimit-Reset:
              $ref: '#/components/headers/RateReset'
            Idempotency-Replayed:
              $ref: '#/components/headers/IdempotencyReplayed'
            X-Coasty-Idempotent-Replay:
              $ref: '#/components/headers/IdempotentReplay'
            Idempotency-Status:
              $ref: '#/components/headers/IdempotencyStatus'
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '402':
          $ref: '#/components/responses/PaymentRequired'
        '403':
          $ref: '#/components/responses/Forbidden'
        '404':
          $ref: '#/components/responses/NotFound'
        '409':
          $ref: '#/components/responses/Conflict'
        '413':
          $ref: '#/components/responses/PayloadTooLarge'
        '422':
          $ref: '#/components/responses/UnprocessableEntity'
        '429':
          $ref: '#/components/responses/RateLimited'
        '500':
          $ref: '#/components/responses/ServerError'
        '502':
          $ref: '#/components/responses/BadGateway'
        '503':
          $ref: '#/components/responses/ServiceUnavailable'
        '504':
          $ref: '#/components/responses/GatewayTimeout'
      x-auth-mode: api_key
      x-required-scope: session
      x-required-scopes:
      - session
      x-scope-policy: required
      x-billing-code: session_create
      x-offering: cua
      x-feature-flag: PUBLIC_CUA_API_ENABLED
      x-idempotency: reserve-and-replay
    get:
      tags:
      - sessions
      operationId: listSessions
      summary: List active sessions
      security:
      - apiKey: []
      - bearerAuth: []
      responses:
        '200':
          description: Active sessions for this key.
          content:
            application/json:
              schema:
                type: object
                properties:
                  sessions:
                    type: array
                    items:
                      $ref: '#/components/schemas/SessionInfoResponse'
          headers:
            X-Coasty-Request-Id:
              $ref: '#/components/headers/CoastyRequestId'
            X-Coasty-Key-Kind:
              $ref: '#/components/headers/KeyKind'
            X-Coasty-Test-Mode:
              $ref: '#/components/headers/TestMode'
            X-Credits-Charged:
              $ref: '#/components/headers/CreditsCharged'
            X-Credits-Remaining:
              $ref: '#/components/headers/CreditsRemaining'
            X-RateLimit-Limit:
              $ref: '#/components/headers/RateLimit'
            X-RateLimit-Remaining:
              $ref: '#/components/headers/RateRemaining'
            X-RateLimit-Reset:
              $ref: '#/components/headers/RateReset'
            RateLimit-Limit:
              $ref: '#/components/headers/RateLimit'
            RateLimit-Remaining:
              $ref: '#/components/headers/RateRemaining'
            RateLimit-Reset:
              $ref: '#/components/headers/RateReset'
            Idempotency-Replayed:
              $ref: '#/components/headers/IdempotencyReplayed'
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '403':
          $ref: '#/components/responses/Forbidden'
        '404':
          $ref: '#/components/responses/NotFound'
        '409':
          $ref: '#/components/responses/Conflict'
        '413':
          $ref: '#/components/responses/PayloadTooLarge'
        '422':
          $ref: '#/components/responses/UnprocessableEntity'
        '429':
          $ref: '#/components/responses/RateLimited'
        '500':
          $ref: '#/components/responses/ServerError'
        '502':
          $ref: '#/components/responses/BadGateway'
        '503':
          $ref: '#/components/responses/ServiceUnavailable'
        '504':
          $ref: '#/components/responses/GatewayTimeout'
      x-auth-mode: api_key
      x-required-scope: session
      x-required-scopes:
      - session
      x-scope-policy: required
      x-billing-code: null
      x-offering: cua
      x-feature-flag: PUBLIC_CUA_API_ENABLED
      x-idempotency: none
  /v1/sessions/{session_id}:
    parameters:
    - $ref: '#/components/parameters/SessionId'
    get:
      tags:
      - sessions
      operationId: getSession
      summary: Get session info
      security:
      - apiKey: []
      - bearerAuth: []
      responses:
        '200':
          description: Session info.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/SessionInfoResponse'
          headers:
            X-Coasty-Request-Id:
              $ref: '#/components/headers/CoastyRequestId'
            X-Coasty-Key-Kind:
              $ref: '#/components/headers/KeyKind'
            X-Coasty-Test-Mode:
              $ref: '#/components/headers/TestMode'
            X-Credits-Charged:
              $ref: '#/components/headers/CreditsCharged'
            X-Credits-Remaining:
              $ref: '#/components/headers/CreditsRemaining'
            X-RateLimit-Limit:
              $ref: '#/components/headers/RateLimit'
            X-RateLimit-Remaining:
              $ref: '#/components/headers/RateRemaining'
            X-RateLimit-Reset:
              $ref: '#/components/headers/RateReset'
            RateLimit-Limit:
              $ref: '#/components/headers/RateLimit'
            RateLimit-Remaining:
              $ref: '#/components/headers/RateRemaining'
            RateLimit-Reset:
              $ref: '#/components/headers/RateReset'
            Idempotency-Replayed:
              $ref: '#/components/headers/IdempotencyReplayed'
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '403':
          $ref: '#/components/responses/Forbidden'
        '404':
          $ref: '#/components/responses/NotFound'
        '409':
          $ref: '#/components/responses/Conflict'
        '413':
          $ref: '#/components/responses/PayloadTooLarge'
        '422':
          $ref: '#/components/responses/UnprocessableEntity'
        '429':
          $ref: '#/components/responses/RateLimited'
        '500':
          $ref: '#/components/responses/ServerError'
        '502':
          $ref: '#/components/responses/BadGateway'
        '503':
          $ref: '#/components/responses/ServiceUnavailable'
        '504':
          $ref: '#/components/responses/GatewayTimeout'
      x-auth-mode: api_key
      x-required-scope: session
      x-required-scopes:
      - session
      x-scope-policy: required
      x-billing-code: null
      x-offering: cua
      x-feature-flag: PUBLIC_CUA_API_ENABLED
      x-idempotency: none
    delete:
      tags:
      - sessions
      operationId: deleteSession
      summary: Delete a session
      security:
      - apiKey: []
      - bearerAuth: []
      responses:
        '200':
          description: Deleted.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/SessionMutationResponse'
          headers:
            X-Coasty-Request-Id:
              $ref: '#/components/headers/CoastyRequestId'
            X-Coasty-Key-Kind:
              $ref: '#/components/headers/KeyKind'
            X-Coasty-Test-Mode:
              $ref: '#/components/headers/TestMode'
            X-Credits-Charged:
              $ref: '#/components/headers/CreditsCharged'
            X-Credits-Remaining:
              $ref: '#/components/headers/CreditsRemaining'
            X-RateLimit-Limit:
              $ref: '#/components/headers/RateLimit'
            X-RateLimit-Remaining:
              $ref: '#/components/headers/RateRemaining'
            X-RateLimit-Reset:
              $ref: '#/components/headers/RateReset'
            RateLimit-Limit:
              $ref: '#/components/headers/RateLimit'
            RateLimit-Remaining:
              $ref: '#/components/headers/RateRemaining'
            RateLimit-Reset:
              $ref: '#/components/headers/RateReset'
            Idempotency-Replayed:
              $ref: '#/components/headers/IdempotencyReplayed'
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '403':
          $ref: '#/components/responses/Forbidden'
        '404':
          $ref: '#/components/responses/NotFound'
        '409':
          $ref: '#/components/responses/Conflict'
        '413':
          $ref: '#/components/responses/PayloadTooLarge'
        '422':
          $ref: '#/components/responses/UnprocessableEntity'
        '429':
          $ref: '#/components/responses/RateLimited'
        '500':
          $ref: '#/components/responses/ServerError'
        '502':
          $ref: '#/components/responses/BadGateway'
        '503':
          $ref: '#/components/responses/ServiceUnavailable'
        '504':
          $ref: '#/components/responses/GatewayTimeout'
      x-auth-mode: api_key
      x-required-scope: session
      x-required-scopes:
      - session
      x-scope-policy: required
      x-billing-code: null
      x-offering: cua
      x-feature-flag: PUBLIC_CUA_API_ENABLED
      x-idempotency: none
  /v1/sessions/{session_id}/predict:
    parameters:
    - $ref: '#/components/parameters/SessionId'
    post:
      tags:
      - sessions
      operationId: sessionPredict
      summary: Predict within an existing session
      security:
      - apiKey: []
      - bearerAuth: []
      parameters:
      - $ref: '#/components/parameters/IdempotencyKey'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/SessionPredictRequest'
      responses:
        '200':
          description: Predicted actions for the next step.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/SessionPredictResponse'
            text/event-stream:
              schema:
                type: string
              description: 'SSE keepalive stream ending with a JSON result event. Request with Accept: text/event-stream.'
          headers:
            X-Coasty-Request-Id:
              $ref: '#/components/headers/CoastyRequestId'
            X-Coasty-Key-Kind:
              $ref: '#/components/headers/KeyKind'
            X-Coasty-Test-Mode:
              $ref: '#/components/headers/TestMode'
            X-Credits-Charged:
              $ref: '#/components/headers/CreditsCharged'
            X-Credits-Remaining:
              $ref: '#/components/headers/CreditsRemaining'
            X-RateLimit-Limit:
              $ref: '#/components/headers/RateLimit'
            X-RateLimit-Remaining:
              $ref: '#/components/headers/RateRemaining'
            X-RateLimit-Reset:
              $ref: '#/components/headers/RateReset'
            RateLimit-Limit:
              $ref: '#/components/headers/RateLimit'
            RateLimit-Remaining:
              $ref: '#/components/headers/RateRemaining'
            RateLimit-Reset:
              $ref: '#/components/headers/RateReset'
            Idempotency-Replayed:
              $ref: '#/components/headers/IdempotencyReplayed'
            X-Coasty-Idempotent-Replay:
              $ref: '#/components/headers/IdempotentReplay'
            Idempotency-Status:
              $ref: '#/components/headers/IdempotencyStatus'
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '402':
          $ref: '#/components/responses/PaymentRequired'
        '403':
          $ref: '#/components/responses/Forbidden'
        '404':
          $ref: '#/components/responses/NotFound'
        '409':
          $ref: '#/components/responses/Conflict'
        '413':
          $ref: '#/components/responses/PayloadTooLarge'
        '422':
          $ref: '#/components/responses/UnprocessableEntity'
        '429':
          $ref: '#/components/responses/RateLimited'
        '500':
          $ref: '#/components/responses/ServerError'
        '502':
          $ref: '#/components/responses/BadGateway'
        '503':
          $ref: '#/components/responses/ServiceUnavailable'
        '504':
          $ref: '#/components/responses/GatewayTimeout'
      x-auth-mode: api_key
      x-required-scope: session
      x-required-scopes:
      - session
      x-scope-policy: required
      x-billing-code: session_predict
      x-offering: cua
      x-feature-flag: PUBLIC_CUA_API_ENABLED
      x-idempotency: reserve-and-replay
  /v1/sessions/{session_id}/reset:
    parameters:
    - $ref: '#/components/parameters/SessionId'
    post:
      tags:
      - sessions
      operationId: resetSession
      summary: Reset session state
      security:
      - apiKey: []
      - bearerAuth: []
      responses:
        '200':
          description: Reset.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/SessionMutationResponse'
          headers:
            X-Coasty-Request-Id:
              $ref: '#/components/headers/CoastyRequestId'
            X-Coasty-Key-Kind:
              $ref: '#/components/headers/KeyKind'
            X-Coasty-Test-Mode:
              $ref: '#/components/headers/TestMode'
            X-Credits-Charged:
              $ref: '#/components/headers/CreditsCharged'
            X-Credits-Remaining:
              $ref: '#/components/headers/CreditsRemaining'
            X-RateLimit-Limit:
              $ref: '#/components/headers/RateLimit'
            X-RateLimit-Remaining:
              $ref: '#/components/headers/RateRemaining'
            X-RateLimit-Reset:
              $ref: '#/components/headers/RateReset'
            RateLimit-Limit:
              $ref: '#/components/headers/RateLimit'
            RateLimit-Remaining:
              $ref: '#/components/headers/RateRemaining'
            RateLimit-Reset:
              $ref: '#/components/headers/RateReset'
            Idempotency-Replayed:
              $ref: '#/components/headers/IdempotencyReplayed'
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '403':
          $ref: '#/components/responses/Forbidden'
        '404':
          $ref: '#/components/responses/NotFound'
        '409':
          $ref: '#/components/responses/Conflict'
        '413':
          $ref: '#/components/responses/PayloadTooLarge'
        '422':
          $ref: '#/components/responses/UnprocessableEntity'
        '429':
          $ref: '#/components/responses/RateLimited'
        '500':
          $ref: '#/components/responses/ServerError'
        '502':
          $ref: '#/components/responses/BadGateway'
        '503':
          $ref: '#/components/responses/ServiceUnavailable'
        '504':
          $ref: '#/components/responses/GatewayTimeout'
      x-auth-mode: api_key
      x-required-scope: session
      x-required-scopes:
      - session
      x-scope-policy: required
      x-billing-code: null
      x-offering: cua
      x-feature-flag: PUBLIC_CUA_API_ENABLED
      x-idempotency: none
components:
  responses:
    RateLimited:
      description: Rate or concurrency limit exceeded.
      headers:
        X-Coasty-Request-Id:
          $ref: '#/components/headers/CoastyRequestId'
        Retry-After:
          $ref: '#/components/headers/RetryAfter'
        X-Credits-Charged:
          $ref: '#/components/headers/CreditsCharged'
        X-Credits-Refunded:
          $ref: '#/components/headers/CreditsRefunded'
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ApiError'
          example:
            error:
              code: RATE_LIMIT_EXCEEDED
              message: An error occurred. See `code` for details.
              type: validation_error
              request_id: req_a1b2c3d4e5f6
              retryable: false
              retry_with_same_idempotency_key: false
    UnprocessableEntity:
      description: The JSON shape is valid but one or more values violate the endpoint contract.
      headers:
        X-Coasty-Request-Id:
          $ref: '#/components/headers/CoastyRequestId'
        Retry-After:
          $ref: '#/components/headers/RetryAfter'
        X-Credits-Charged:
          $ref: '#/components/headers/CreditsCharged'
        X-Credits-Refunded:
          $ref: '#/components/headers/CreditsRefunded'
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ApiError'
          example:
            error:
              code: VALIDATION_ERROR
              message: An error occurred. See `code` for details.
              type: validation_error
              request_id: req_a1b2c3d4e5f6
              retryable: false
              retry_with_same_idempotency_key: false
    Unauthorized:
      description: 'Missing, invalid, or revoked API key. Pass `X-API-Key: sk-coasty-live-...` (or test).'
      headers:
        X-Coasty-Request-Id:
          $ref: '#/components/headers/CoastyRequestId'
        Retry-After:
          $ref: '#/components/headers/RetryAfter'
        X-Credits-Charged:
          $ref: '#/components/headers/CreditsCharged'
        X-Credits-Refunded:
          $ref: '#/components/headers/CreditsRefunded'
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ApiError'
          example:
            error:
              code: INVALID_API_KEY
              message: An error occurred. See `code` for details.
              type: validation_error
              request_id: req_a1b2c3d4e5f6
              retryable: false
              retry_with_same_idempotency_key: false
    Forbidden:
      description: API key lacks the required scope or tier-feature is unavailable on the caller's plan.
      headers:
        X-Coasty-Request-Id:
          $ref: '#/components/headers/CoastyRequestId'
        Retry-After:
          $ref: '#/components/headers/RetryAfter'
        X-Credits-Charged:
          $ref: '#/components/headers/CreditsCharged'
        X-Credits-Refunded:
          $ref: '#/components/headers/CreditsRefunded'
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ApiError'
          example:
            error:
              code: INSUFFICIENT_SCOPE
              message: An error occurred. See `code` for details.
              type: validation_error
              request_id: req_a1b2c3d4e5f6
              retryable: false
              retry_with_same_idempotency_key: false
    BadRequest:
      description: Invalid request body or parameters.
      headers:
        X-Coasty-Request-Id:
          $ref: '#/components/headers/CoastyRequestId'
        Retry-After:
          $ref: '#/components/headers/RetryAfter'
        X-Credits-Charged:
          $ref: '#/components/headers/CreditsCharged'
        X-Credits-Refunded:
          $ref: '#/components/headers/CreditsRefunded'
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ApiError'
          example:
            error:
              code: VALIDATION_ERROR
              message: An error occurred. See `code` for details.
              type: validation_error
              request_id: req_a1b2c3d4e5f6
              retryable: false
              retry_with_same_idempotency_key: false
    Conflict:
      description: The resource state conflicts with this operation.
      headers:
        X-Coasty-Request-Id:
          $ref: '#/components/headers/CoastyRequestId'
        Retry-After:
          $ref: '#/components/headers/RetryAfter'
        X-Credits-Charged:
          $ref: '#/components/headers/CreditsCharged'
        X-Credits-Refunded:
          $ref: '#/components/headers/CreditsRefunded'
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ApiError'
          example:
            error:
              code: CONFLICT
              message: An error occurred. See `code` for details.
              type: validation_error
              request_id: req_a1b2c3d4e5f6
              retryable: false
              retry_with_same_idempotency_key: false
    GatewayTimeout:
      description: An upstream dependency timed out.
      headers:
        X-Coasty-Request-Id:
          $ref: '#/components/headers/CoastyRequestId'
        Retry-After:
          $ref: '#/components/headers/RetryAfter'
        X-Credits-Charged:
          $ref: '#/components/headers/CreditsCharged'
        X-Credits-Refunded:
          $ref: '#/components/headers/CreditsRefunded'
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ApiError'
          example:
            error:
              code: UPSTREAM_TIMEOUT
              message: An error occurred. See `code` for details.
              type: validation_error
              request_id: req_a1b2c3d4e5f6
              retryable: false
              retry_with_same_idempotency_key: false
    PayloadTooLarge:
      description: The request body exceeds the endpoint limit.
      headers:
        X-Coasty-Request-Id:
          $ref: '#/components/headers/CoastyRequestId'
        Retry-After:
          $ref: '#/components/headers/RetryAfter'
        X-Credits-Charged:
          $ref: '#/components/headers/CreditsCharged'
        X-Credits-Refunded:
          $ref: '#/components/headers/CreditsRefunded'
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ApiError'
          example:
            error:
              code: PAYLOAD_TOO_LARGE
              message: An error occurred. See `code` for details.
              type: validation_error
              request_id: req_a1b2c3d4e5f6
              retryable: false
              retry_with_same_idempotency_key: false
    ServerError:
      description: Unexpected server error. Retry with exponential backoff.
      headers:
        X-Coasty-Request-Id:
          $ref: '#/components/headers/CoastyRequestId'
        Retry-After:
          $ref: '#/components/headers/RetryAfter'
        X-Credits-Charged:
          $ref: '#/components/headers/CreditsCharged'
        X-Credits-Refunded:
          $ref: '#/components/headers/CreditsRefunded'
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ApiError'
          example:
            error:
              code: INTERNAL_ERROR
              message: An error occurred. See `code` for details.
              type: validation_error
              request_id: req_a1b2c3d4e5f6
              retryable: false
              retry_with_same_idempotency_key: false
    NotFound:
      description: Resource not found in this key's namespace.
      headers:
        X-Coasty-Request-Id:
          $ref: '#/components/headers/CoastyRequestId'
        Retry-After:
          $ref: '#/components/headers/RetryAfter'
        X-Credits-Charged:
          $ref: '#/components/headers/CreditsCharged'
        X-Credits-Refunded:
          $ref: '#/components/headers/CreditsRefunded'
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ApiError'
          example:
            error:
              code: NOT_FOUND
              message: An error occurred. See `code` for details.
              type: validation_error
              request_id: req_a1b2c3d4e5f6
              retryable: false
              retry_with_same_idempotency_key: false
    ServiceUnavailable:
      description: A required service is temporarily unavailable.
      headers:
        X-Coasty-Request-Id:
          $ref: '#/components/headers/CoastyRequestId'
        Retry-After:
          $ref: '#/components/headers/RetryAfter'
        X-Credits-Charged:
          $ref: '#/components/headers/CreditsCharged'
        X-Credits-Refunded:
          $ref: '#/components/headers/CreditsRefunded'
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ApiError'
          example:
            error:
              code: SERVICE_UNAVAILABLE
              message: An error occurred. See `code` for details.
              type: validation_error
              request_id: req_a1b2c3d4e5f6
              retryable: false
              retry_with_same_idempotency_key: false
    BadGateway:
      description: An upstream dependency returned an invalid response.
      headers:
        X-Coasty-Request-Id:
          $ref: '#/components/headers/CoastyRequestId'
        Retry-After:
          $ref: '#/components/headers/RetryAfter'
        X-Credits-Charged:
          $ref: '#/components/headers/CreditsCharged'
        X-Credits-Refunded:
          $ref: '#/components/headers/CreditsRefunded'
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ApiError'
          example:
            error:
              code: UPSTREAM_ERROR
              message: An error occurred. See `code` for details.
              type: validation_error
              request_id: req_a1b2c3d4e5f6
              retryable: false
              retry_with_same_idempotency_key: false
    PaymentRequired:
      description: Insufficient credits to perform the operation. Top up via /credits or upgrade subscription.
      headers:
        X-Coasty-Request-Id:
          $ref: '#/components/headers/CoastyRequestId'
        Retry-After:
          $ref: '#/components/headers/RetryAfter'
        X-Credits-Charged:
          $ref: '#/components/headers/CreditsCharged'
        X-Credits-Refunded:
          $ref: '#/components/headers/CreditsRefunded'
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ApiError'
          example:
            error:
              code: INSUFFICIENT_CREDITS
              message: An error occurred. See `code` for details.
              type: validation_error
              request_id: req_a1b2c3d4e5f6
              retryable: false
              retry_with_same_idempotency_key: false
  headers:
    RateRemaining:
      description: Requests remaining in the current window.
      schema:
        type: integer
        minimum: 0
    RateLimit:
      description: Effective request limit for the current window.
      schema:
        type: integer
        minimum: 0
    CoastyRequestId:
      description: Coasty correlation identifier for this request.
      schema:
        type: string
    KeyKind:
      description: Whether the authenticated key is live or test.
      schema:
        type: string
        enum:
        - live
        - test
        - legacy
    TestMode:
      description: true when the request executed against the sandbox namespace.
      schema:
        type: boolean
    RetryAfter:
      description: Seconds to wait before retrying. Present on retryable back-pressure and transient failures.
      schema:
        type: integer
        minimum: 0
    CreditsRefunded:
      description: Credits durably returned to the wallet after a failed billed operatio

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# Full source: https://raw.githubusercontent.com/api-evangelist/coasty/refs/heads/main/openapi/coasty-sessions-api-openapi.yml