> ## Documentation Index > Fetch the complete documentation index at: https://platform.atlan.com/llms.txt > Use this file to discover all available pages before exploring further. > ## Agent Instructions > To act on Atlan objects, use the Atlan MCP server at https://api.atlan.com/mcp or the SDK. To install or publish skills from a terminal, use the `aireg` CLI; `aireg --map json` prints its command map. The `atlanai` CLI is deprecated. Run a read-only identity check before any write. > The docs MCP server at /mcp searches these docs only. It cannot read or change Atlan objects. > SDK packages: Python `atlanai` (PyPI) and TypeScript `@atlanai/sdk` (npm). Show Python first, then TypeScript. > These docs cover Atlan Trident, Atlan's hosted product. AI Registry and Agent Registry are its earlier names. Registry OSS is Atlan's open-source agent registry: the registry specification and its aireg CLI, with their own public repository, docs and release notes; /open-source on this site links them. Registry OSS is open source; Atlan Trident is not. Answer generic aireg or specification questions from the project's docs, and use these docs for Atlan-specific setup such as the Atlan adapter, sign-in and workspaces. # Try one endpoint of an MCP definition ## OpenAPI ````yaml /public-openapi.json post /mcp/v1/definitions/{definition_id}/test openapi: 3.1.0 info: title: Atlan public API version: current description: >- Public HTTP API reference for Registry, Skills, Agents, outputs, files, MCP servers and tools, Model Gateway, and OTLP telemetry ingestion. servers: - url: https://api.atlan.com description: Atlan API base URL security: - bearer: [] tags: - name: Core - name: Skill - name: Agent - name: Files - name: Knowledge - name: MCP - name: Observability - name: API proxy - name: Credentials - name: Store - name: Apps - name: Evals - name: Ontologies - name: Ontology bindings - name: Slack - name: GitHub - name: Objectives - name: Repositories - name: Models paths: /mcp/v1/definitions/{definition_id}/test: post: tags: - MCP summary: Try one endpoint of an MCP definition operationId: mcp.testDefinition parameters: - in: path name: definition_id required: true schema: type: string - name: Content-Encoding in: header required: false schema: type: string enum: - base64 - gzip, base64 requestBody: content: application/json: schema: $ref: '#/components/schemas/mcp-mcp-TestDefinition' required: true responses: '200': content: application/json: schema: $ref: '#/components/schemas/mcp-mcp-TestedDefinition' description: HTTP 200 response. '400': content: application/problem+json: schema: allOf: - $ref: '#/components/schemas/mcp-ProblemDetails' - properties: code: enum: - invalid_base64 - invalid_gzip - invalid_json - invalid_query - invalid_request type: string required: - code type: object description: HTTP 400 response. '401': content: application/problem+json: schema: allOf: - $ref: '#/components/schemas/mcp-ProblemDetails' - type: object required: - code properties: code: type: string enum: - alg_mismatch - alg_not_allowed - audience_mismatch - invalid_api_key - missing_identity - missing_org - missing_user - signature_invalid - token_expired - token_malformed - token_missing - token_not_yet_valid - token_rejected - token_service_account_unbound - unauthorized - unknown_account - unknown_key - untrusted_issuer description: HTTP 401 response. '403': content: application/problem+json: schema: allOf: - $ref: '#/components/schemas/mcp-ProblemDetails' - type: object required: - code properties: code: type: string enum: - access_denied - account_suspended - forbidden - platform_principal_refused description: HTTP 403 response. '404': content: application/problem+json: schema: allOf: - $ref: '#/components/schemas/mcp-ProblemDetails' - type: object required: - code properties: code: type: string enum: - not_found description: HTTP 404 response. '413': content: application/problem+json: schema: allOf: - $ref: '#/components/schemas/mcp-ProblemDetails' - type: object required: - code properties: code: type: string enum: - compressed_payload_too_large - decompressed_payload_too_large - payload_too_large description: HTTP 413 response. '415': content: application/problem+json: schema: allOf: - $ref: '#/components/schemas/mcp-ProblemDetails' - type: object required: - code properties: code: type: string enum: - unsupported_content_encoding - unsupported_content_type description: HTTP 415 response. '422': content: application/problem+json: schema: allOf: - $ref: '#/components/schemas/mcp-ProblemDetails' - type: object required: - code properties: code: type: string enum: - validation_failed description: HTTP 422 response. '429': content: application/problem+json: schema: allOf: - $ref: '#/components/schemas/mcp-ProblemDetails' - type: object required: - code properties: code: type: string enum: - rate_limited description: HTTP 429 response. '500': content: application/problem+json: schema: allOf: - $ref: '#/components/schemas/mcp-ProblemDetails' - type: object required: - code properties: code: type: string enum: - internal_error description: HTTP 500 response. '503': content: application/problem+json: schema: allOf: - $ref: '#/components/schemas/mcp-ProblemDetails' - type: object required: - code properties: code: type: string enum: - auth_unavailable - service_overloaded - service_unavailable description: HTTP 503 response. '504': content: application/problem+json: schema: allOf: - $ref: '#/components/schemas/mcp-ProblemDetails' - type: object required: - code properties: code: type: string enum: - request_timeout description: HTTP 504 response. components: schemas: mcp-mcp-TestDefinition: additionalProperties: false properties: inputs: additionalProperties: type: string propertyNames: type: string type: object remote_index: type: integer format: int32 minimum: 0 version: type: - integer - 'null' format: int64 required: - remote_index type: object mcp-mcp-TestedDefinition: properties: definition_version_id: type: string endpoint_url: type: - string - 'null' error: type: - string - 'null' probe: oneOf: - $ref: '#/components/schemas/mcp-mcp-McpDiscoverResponse' - type: 'null' required: - definition_version_id type: object mcp-ProblemDetails: type: object required: - title - status - detail - code properties: code: type: string detail: type: string status: type: integer format: int32 minimum: 0 title: type: string trace_id: type: - string - 'null' mcp-mcp-McpDiscoverResponse: properties: auth: type: - string - 'null' callback_url_template: type: - string - 'null' challenge: oneOf: - $ref: '#/components/schemas/mcp-mcp-McpDiscoverChallenge' - type: 'null' is_reachable: type: boolean oauth: oneOf: - $ref: '#/components/schemas/mcp-mcp-McpDiscoverOauth' - type: 'null' problem: type: - string - 'null' server_title: type: - string - 'null' tool_count: minimum: 0 type: - integer - 'null' required: - is_reachable type: object mcp-mcp-McpDiscoverChallenge: properties: realm: type: - string - 'null' scheme: type: string required: - scheme type: object mcp-mcp-McpDiscoverOauth: properties: authorization_url: type: string client_strategy: type: string existing_provider: oneOf: - $ref: '#/components/schemas/mcp-mcp-McpExistingProvider' - type: 'null' issuer: type: string resource: type: string scope_hint: type: - string - 'null' scopes_supported: type: array items: type: string token_url: type: string required: - resource - issuer - authorization_url - token_url - scopes_supported - client_strategy type: object mcp-mcp-McpExistingProvider: properties: client_status: type: string is_enabled: type: boolean key: type: string required: - key - is_enabled - client_status type: object securitySchemes: bearer: bearerFormat: JWT scheme: bearer type: http ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.