> ## Documentation Index > Fetch the complete documentation index at: https://docs.corepillar.ai/llms.txt > Use this file to discover all available pages before exploring further. # Extract source text > Step 1 of synthetic setup: turns pasted text, a URL or an uploaded file into readable text, and returns the cost estimate for the synthesis step. No model is called. Files are limited to 4 MB; extracted text is truncated at 60,000 characters. **Auth:** session. **Permission:** `run_agents` or `manage_agents`. ## OpenAPI ````yaml /api-reference/openapi.json post /projects/{projectId}/synthetic/extract openapi: 3.1.0 info: title: CorePillar API version: 1.0.0 description: >- REST API for AgentHub and ModelHub. Ingestion endpoints authenticate with a project tracing key; all other endpoints use the signed-in user's browser session. servers: - url: https://pillarforge.corepillar.ai/api/v1 description: AgentHub security: [] tags: - name: Ingestion description: 'Send traces with a tracing key: JSON ingest and OpenTelemetry (OTLP).' - name: Traces description: Read traces and spans. - name: Evaluations description: Evaluate traces with evaluator collections. - name: Evaluators description: Built-in and custom evaluators. - name: Evaluator collections description: Ordered groups of evaluators. - name: Organizations description: Organizations you belong to. - name: Members description: Organization members, invites and roles. - name: Projects description: Projects inside an organization. - name: SSO description: Okta SSO configuration. - name: Tracing keys description: Create, list and revoke project tracing keys. - name: Cost calculator description: Estimate, generate and execute scenario runs. - name: Synthetic description: Synthetic agent and data setup from source material. - name: Chat description: ModelHub chat. Served at https://modelhub.corepillar.ai/api/v1. - name: Auth description: Sign-in helpers. - name: E2E description: Internal end-to-end encryption key directory. paths: /projects/{projectId}/synthetic/extract: post: tags: - Synthetic summary: Extract source text description: >- Step 1 of synthetic setup: turns pasted text, a URL or an uploaded file into readable text, and returns the cost estimate for the synthesis step. No model is called. Files are limited to 4 MB; extracted text is truncated at 60,000 characters. **Auth:** session. **Permission:** `run_agents` or `manage_agents`. operationId: syntheticExtract parameters: - name: projectId in: path required: true description: Project id. schema: type: string format: uuid requestBody: required: true content: application/json: schema: oneOf: - title: Text type: object required: - kind - text properties: kind: type: string const: text text: type: string minLength: 40 maxLength: 200000 label: type: string maxLength: 200 - title: URL type: object required: - kind - url properties: kind: type: string const: url url: type: string minLength: 4 maxLength: 2048 - title: File type: object required: - kind - filename - content_base64 properties: kind: type: string const: file filename: type: string minLength: 1 maxLength: 200 content_base64: type: string description: The file, base64-encoded. Up to 4 MB decoded. discriminator: propertyName: kind responses: '200': description: Extracted source and estimate. content: application/json: schema: type: object required: - data properties: data: type: object properties: source: $ref: '#/components/schemas/ExtractedSource' estimate: type: object additionalProperties: true '400': description: Validation failed. `error.code` is `VALIDATION_ERROR`. content: application/json: schema: $ref: '#/components/schemas/ErrorEnvelope' '401': description: Not signed in (`UNAUTHORIZED`). content: application/json: schema: $ref: '#/components/schemas/ErrorEnvelope' '403': description: >- Not a member of the organization, or missing the required permission (`FORBIDDEN`). content: application/json: schema: $ref: '#/components/schemas/ErrorEnvelope' '404': description: Project not found or not visible to you (`PROJECT_NOT_FOUND`). content: application/json: schema: $ref: '#/components/schemas/ErrorEnvelope' '413': description: Body or file too large (`VALIDATION_ERROR`). content: application/json: schema: $ref: '#/components/schemas/ErrorEnvelope' '415': description: '`Content-Type` isn''t `application/json` (`VALIDATION_ERROR`).' content: application/json: schema: $ref: '#/components/schemas/ErrorEnvelope' '422': description: >- Not enough readable text, unsupported document, or blocked URL (`VALIDATION_ERROR`; `details` may include `hint` or `target`). content: application/json: schema: $ref: '#/components/schemas/ErrorEnvelope' '500': description: Unexpected server error (`INTERNAL_ERROR`). content: application/json: schema: $ref: '#/components/schemas/ErrorEnvelope' security: - session: [] components: schemas: ExtractedSource: type: object required: - kind - text properties: kind: type: string enum: - text - url - file label: type: string maxLength: 2048 default: Pasted text title: type: string maxLength: 300 default: '' format: type: string enum: - markdown - text - html - docx - pdf - json default: text text: type: string minLength: 1 maxLength: 60000 chars: type: integer minimum: 0 default: 0 truncated: type: boolean default: false notes: type: array maxItems: 10 items: type: string maxLength: 500 default: [] ErrorEnvelope: type: object required: - error properties: error: type: object required: - code - message properties: code: type: string description: Stable machine-readable code. Branch on this, not on `message`. examples: - VALIDATION_ERROR message: type: string description: Human-readable description. May change. details: type: object additionalProperties: true description: Extra context; often empty. securitySchemes: session: type: apiKey in: cookie name: session description: >- The session cookie set when you sign in to AgentHub or ModelHub in a browser. The cookie name shown here is illustrative. There are no API tokens for these endpoints. ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.