> ## Documentation Index > Fetch the complete documentation index at: https://docs.polymorfa.com/llms.txt > Use this file to discover all available pages before exploring further. # Start project session > Starts a stopped session or retries a session whose runtime failed. The identifier may be the session UUID or stable session slug. Requires `sessions:manage`. Project tokens only access resources in their own project. ## OpenAPI ````yaml api-reference/features/connect.json POST /platform/sessions/{sessionId}/start openapi: 3.0.3 info: title: Connect API methods version: 1.0.0 description: Task-focused connect methods across supported Polymorfa connection types. servers: [] security: [] paths: /platform/sessions/{sessionId}/start: post: tags: - Sessions summary: Start project session description: >- Starts a stopped session or retries a session whose runtime failed. The identifier may be the session UUID or stable session slug. Requires `sessions:manage`. Project tokens only access resources in their own project. operationId: managementStartPlatformSession parameters: - name: sessionId in: path required: true description: |- Database session UUID or stable session slug. **Value constraints** | Constraint | Accepted input | | --- | --- | | String length | `1` through `64` characters | schema: $ref: '#/components/schemas/management__SessionIdentifier' requestBody: required: false content: application/json: schema: $ref: '#/components/schemas/management__SessionProjectContext' responses: '200': description: Success headers: X-Request-Id: schema: type: string description: Stable request correlation identifier. Polymorfa-Version: schema: type: string description: API version applied to this response. content: application/json: schema: type: object additionalProperties: false properties: data: allOf: - $ref: '#/components/schemas/management__SessionStartResult' description: Structured data carried by this object. required: - data '401': $ref: '#/components/responses/management__Unauthorized' '403': $ref: '#/components/responses/management__Forbidden' '404': $ref: '#/components/responses/management__NotFound' '409': $ref: '#/components/responses/management__Conflict' '500': $ref: '#/components/responses/management__InternalError' security: - management__ApiKeyAuth: [] servers: - url: https://api.polymorfa.com - url: http://localhost:8080 description: local dev components: schemas: management__SessionIdentifier: type: string minLength: 1 maxLength: 64 description: Database session UUID or stable session slug. management__SessionProjectContext: type: object additionalProperties: false properties: projectId: allOf: - $ref: '#/components/schemas/management__ProjectId' description: |- Identifier of the Polymorfa project that owns this resource. **Value constraints** | Constraint | Accepted input | | --- | --- | | Format | `uuid` | management__SessionStartResult: type: object additionalProperties: false properties: starting: type: boolean enum: - true description: |- Whether starting. **Allowed values** | Value | Meaning | | --- | --- | | `true` | True. | sessionId: type: string format: uuid description: |- Identifier of the connected Polymorfa session. **Value constraints** | Constraint | Accepted input | | --- | --- | | Format | `uuid` | required: - starting - sessionId management__ProjectId: type: string format: uuid description: >- Project UUID. Optional where an operation can infer or search organization scope; required where the operation creates a project-owned resource. management__ErrorEnvelope: type: object required: - error - data - docs properties: error: type: object required: - type - code - message - param properties: type: type: string enum: - invalid_request_error - authentication_error - permission_error - conflict_error - rate_limit_error - api_error - upstream_error description: |- Type discriminator for this object. **Allowed values** | Value | Meaning | | --- | --- | | `invalid_request_error` | Invalid request error. | | `authentication_error` | Authentication error. | | `permission_error` | Permission error. | | `conflict_error` | Conflict error. | | `rate_limit_error` | Rate limit error. | | `api_error` | Api error. | | `upstream_error` | Upstream error. | code: type: string description: Stable failure code. Use this value for programmatic handling. message: type: string description: Safe explanation of the failure. param: type: string nullable: true description: |- Invalid request field, or null when no field applies. **Accepted alternatives** | Alternative | Accepted input | | --- | --- | | Alternative 1 | Type: `string` | | Alternative 2 | `null` | description: Error details returned when the operation fails. data: type: string nullable: true enum: - null description: |- Always null for a failed request. **Allowed values** | Value | Meaning | | --- | --- | | `null` | Null. | **Accepted alternatives** | Alternative | Accepted input | | --- | --- | | Alternative 1 | Type: `string` | | Alternative 2 | `null` | docs: type: string format: uri description: |- Documentation link to this failure code. **Value constraints** | Constraint | Accepted input | | --- | --- | | Format | `uri` | responses: management__Unauthorized: description: Missing/invalid credential for this audience. headers: X-Request-Id: schema: type: string description: Stable request correlation identifier. Polymorfa-Version: schema: type: string description: API version applied to this response. content: application/json: schema: $ref: '#/components/schemas/management__ErrorEnvelope' management__Forbidden: description: Authenticated but lacks the required scope/role/audience. headers: X-Request-Id: schema: type: string description: Stable request correlation identifier. Polymorfa-Version: schema: type: string description: API version applied to this response. content: application/json: schema: $ref: '#/components/schemas/management__ErrorEnvelope' management__NotFound: description: >- The requested resource was not found inside the authenticated organization or project scope. headers: X-Request-Id: schema: type: string description: Stable request correlation identifier. Polymorfa-Version: schema: type: string description: API version applied to this response. content: application/json: schema: $ref: '#/components/schemas/management__ErrorEnvelope' management__Conflict: description: The request conflicts with the resource's current state. headers: X-Request-Id: schema: type: string description: Stable request correlation identifier. Polymorfa-Version: schema: type: string description: API version applied to this response. content: application/json: schema: $ref: '#/components/schemas/management__ErrorEnvelope' management__InternalError: description: >- The session-control publisher or testing-number persistence path is temporarily unavailable. headers: X-Request-Id: schema: type: string description: Stable request correlation identifier. Polymorfa-Version: schema: type: string description: API version applied to this response. content: application/json: schema: $ref: '#/components/schemas/management__ErrorEnvelope' securitySchemes: management__ApiKeyAuth: type: http scheme: bearer description: >- Polymorfa server credential: a scoped pmfa_ organization key, or a pmfa_pt_ project token on project- and session-bound operations inside its exact authenticated project. Keys may be personal or service-account owned. Both enforce selected action scopes; organization keys can address team resources and every project in the organization. Listener and browser client credentials are rejected. ````