> ## Documentation Index
> Fetch the complete documentation index at: https://docs.rafflesia.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Retrieve an immutable reusable homology target space



## OpenAPI

````yaml /api-reference/openapi.json get /v1/homology_target_spaces/{homology_target_space_id}
openapi: 3.1.0
info:
  description: >-
    Deterministic biological evidence primitives. Every response is the same
    envelope: ok, data, warnings, provenance.
  title: Rafflesia API
  version: 0.1.0
servers:
  - description: Production
    url: https://api.rafflesia.ai
security:
  - bearerAuth: []
paths:
  /v1/homology_target_spaces/{homology_target_space_id}:
    get:
      tags:
        - Homology target spaces
      summary: Retrieve an immutable reusable homology target space
      operationId: homology_target_spaces_get
      parameters:
        - in: path
          name: homology_target_space_id
          required: true
          schema:
            pattern: ^htsp_[0-9a-f]{64}$
            type: string
      responses:
        '200':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/EnvelopeHomologyTargetSpace'
          description: OK
          headers:
            Rafflesia-Contract-Digest:
              schema:
                type: string
            Rafflesia-Version:
              schema:
                type: string
            X-Request-ID:
              schema:
                type: string
        default:
          content:
            application/problem+json:
              schema:
                $ref: '#/components/schemas/ErrorModel'
          description: Error
components:
  schemas:
    EnvelopeHomologyTargetSpace:
      additionalProperties: false
      properties:
        $schema:
          description: A URL to the JSON Schema for this object.
          examples:
            - https://example.com/schemas/EnvelopeHomologyTargetSpace.json
          format: uri
          readOnly: true
          type: string
        data:
          $ref: '#/components/schemas/HomologyTargetSpace'
          description: Operation result data.
        error:
          $ref: '#/components/schemas/APIError'
          description: Structured error information.
        evidence:
          $ref: '#/components/schemas/EvidenceSummary'
          description: Mechanical evidence summary for agent inspection and chaining.
        ok:
          description: Whether the operation succeeded.
          type: boolean
        provenance:
          $ref: '#/components/schemas/Provenance'
          description: Execution provenance.
        warnings:
          description: Non-fatal warnings.
          items:
            $ref: '#/components/schemas/Warning'
          type:
            - array
            - 'null'
      required:
        - ok
        - warnings
        - provenance
      type: object
    ErrorModel:
      additionalProperties: false
      properties:
        $schema:
          description: A URL to the JSON Schema for this object.
          examples:
            - https://example.com/schemas/ErrorModel.json
          format: uri
          readOnly: true
          type: string
        detail:
          description: >-
            A human-readable explanation specific to this occurrence of the
            problem.
          examples:
            - Property foo is required but is missing.
          type: string
        errors:
          description: Optional list of individual error details
          items:
            $ref: '#/components/schemas/ErrorDetail'
          type:
            - array
            - 'null'
        instance:
          description: >-
            A URI reference that identifies the specific occurrence of the
            problem.
          examples:
            - https://example.com/error-log/abc123
          format: uri
          type: string
        status:
          description: HTTP status code
          examples:
            - 400
          format: int64
          type: integer
        title:
          description: >-
            A short, human-readable summary of the problem type. This value
            should not change between occurrences of the error.
          examples:
            - Bad Request
          type: string
        type:
          default: about:blank
          description: A URI reference to human-readable documentation for the error.
          examples:
            - https://example.com/errors/example
          format: uri
          type: string
      type: object
    HomologyTargetSpace:
      additionalProperties: false
      properties:
        canonical_filter_sha256:
          type: string
        corpus_snapshot_id:
          type: string
        database_release_id:
          type: string
        eligibility_authority_id:
          type: string
        eligible_record_count:
          format: int64
          type: integer
        eligible_residue_count:
          format: int64
          type: integer
        filter:
          $ref: '#/components/schemas/HomologyDocumentFilter'
        filter_schema_id:
          type: string
        id:
          pattern: ^htsp_[0-9a-f]{64}$
          type: string
        object:
          enum:
            - homology_target_space
          type: string
        search_policy_ids:
          items:
            type: string
          type:
            - array
            - 'null'
        semantic_profile_id:
          type: string
        target_space_authority_id:
          type: string
        total_record_count:
          format: int64
          type: integer
        unknown_record_count:
          format: int64
          type: integer
      required:
        - id
        - object
        - database_release_id
        - corpus_snapshot_id
        - semantic_profile_id
        - filter_schema_id
        - filter
        - canonical_filter_sha256
        - total_record_count
        - eligible_record_count
        - eligible_residue_count
        - unknown_record_count
        - eligibility_authority_id
        - target_space_authority_id
        - search_policy_ids
      type: object
    APIError:
      additionalProperties: false
      properties:
        code:
          description: Stable specific error code.
          type: string
        details:
          additionalProperties: {}
          description: Additional structured error details.
          type: object
        doc_url:
          description: Stable documentation URL for this error code.
          type: string
        message:
          description: Human-readable error message.
          type: string
        param:
          description: Request field responsible for the error when known.
          type: string
        type:
          description: Stable coarse error category.
          enum:
            - invalid_request_error
            - resource_missing
            - conflict_error
            - rate_limit_error
            - authentication_error
            - permission_error
            - billing_error
            - api_error
          type: string
      required:
        - type
        - code
        - message
        - doc_url
      type: object
    EvidenceSummary:
      additionalProperties: false
      properties:
        duration_ms:
          description: >-
            Primary elapsed duration in milliseconds when the response exposes
            one.
          format: int64
          type: integer
        input_refs:
          description: >-
            Input references detected from request fields such as object_id,
            structure_id, target_id, and sequence_id.
          items:
            type: string
          type:
            - array
            - 'null'
        object_refs:
          description: Object ids or object refs visible in the response/provenance.
          items:
            type: string
          type:
            - array
            - 'null'
        output_refs:
          description: Output references detected from response data and generated objects.
          items:
            type: string
          type:
            - array
            - 'null'
        row_count:
          description: >-
            Primary row count or returned row count when the response exposes
            one.
          format: int64
          type: integer
        warnings_count:
          description: Number of non-fatal warnings in the envelope.
          format: int64
          type: integer
      required:
        - warnings_count
      type: object
    Provenance:
      additionalProperties: false
      properties:
        cache_hit:
          description: Whether cached output was reused.
          type: boolean
        created_at:
          description: UTC timestamp.
          type: string
        database_snapshots:
          description: Database snapshots used.
          items:
            $ref: '#/components/schemas/DatabaseSnapshot'
          type:
            - array
            - 'null'
        generated_object_ids:
          description: Object ids created by the operation.
          items:
            type: string
          type:
            - array
            - 'null'
        input_hash:
          description: SHA-256 hash of canonical request input.
          type: string
        operation:
          description: Primitive operation id.
          type: string
        parameters_hash:
          description: SHA-256 hash of parameters.
          type: string
        request_id:
          description: Unique request identifier.
          type: string
        server_version:
          description: Server version.
          type: string
        tool_versions:
          description: Tool versions used.
          items:
            $ref: '#/components/schemas/ToolVersion'
          type:
            - array
            - 'null'
      required:
        - request_id
        - operation
        - created_at
        - server_version
      type: object
    Warning:
      additionalProperties: false
      properties:
        code:
          description: Stable warning code.
          type: string
        details:
          additionalProperties: {}
          description: Additional structured warning details.
          type: object
        message:
          description: Human-readable warning message.
          type: string
      required:
        - code
        - message
      type: object
    ErrorDetail:
      additionalProperties: false
      properties:
        location:
          description: >-
            Where the error occurred, e.g. 'body.items[3].tags' or
            'path.thing-id'
          type: string
        message:
          description: Error message text
          type: string
        value:
          description: The value at the given location
      type: object
    HomologyDocumentFilter:
      additionalProperties: false
      description: >-
        Recursive metadata predicate defining the eligible target population.
        Field/operator compatibility and limits come from the immutable filter
        schema for the selected release. Missing fields use strong Kleene logic;
        only true records are eligible.
      discriminator:
        propertyName: op
      oneOf:
        - $ref: '#/components/schemas/HomologyFilterAnd'
        - $ref: '#/components/schemas/HomologyFilterOr'
        - $ref: '#/components/schemas/HomologyFilterNot'
        - $ref: '#/components/schemas/HomologyFilterEq'
        - $ref: '#/components/schemas/HomologyFilterIn'
        - $ref: '#/components/schemas/HomologyFilterLt'
        - $ref: '#/components/schemas/HomologyFilterLte'
        - $ref: '#/components/schemas/HomologyFilterGt'
        - $ref: '#/components/schemas/HomologyFilterGte'
        - $ref: '#/components/schemas/HomologyFilterContains'
        - $ref: '#/components/schemas/HomologyFilterContainsAny'
        - $ref: '#/components/schemas/HomologyFilterContainsAll'
        - $ref: '#/components/schemas/HomologyFilterExists'
      properties:
        field:
          maxLength: 256
          pattern: ^[a-z0-9_]+$
          type: string
        filter:
          $ref: '#/components/schemas/HomologyDocumentFilter'
        filters:
          items:
            $ref: '#/components/schemas/HomologyDocumentFilter'
          maxItems: 256
          minItems: 1
          type: array
        op:
          enum:
            - and
            - or
            - not
            - eq
            - in
            - lt
            - lte
            - gt
            - gte
            - contains
            - contains_any
            - contains_all
            - exists
          type: string
        value:
          oneOf:
            - maxLength: 16384
              type: string
            - type: integer
            - type: boolean
        values:
          items:
            oneOf:
              - maxLength: 16384
                type: string
              - type: integer
              - type: boolean
          maxItems: 4096
          minItems: 1
          type: array
      required:
        - op
      type: object
    DatabaseSnapshot:
      additionalProperties: false
      properties:
        digest:
          type: string
        kind:
          type: string
        name:
          type: string
        version:
          type: string
      required:
        - name
        - version
      type: object
    ToolVersion:
      additionalProperties: false
      properties:
        name:
          type: string
        path:
          type: string
        version:
          type: string
      required:
        - name
        - version
      type: object
    HomologyFilterAnd:
      additionalProperties: false
      properties:
        filters:
          items:
            $ref: '#/components/schemas/HomologyDocumentFilter'
          maxItems: 256
          minItems: 1
          type: array
        op:
          enum:
            - and
          type: string
      required:
        - op
        - filters
      type: object
    HomologyFilterOr:
      additionalProperties: false
      properties:
        filters:
          items:
            $ref: '#/components/schemas/HomologyDocumentFilter'
          maxItems: 256
          minItems: 1
          type: array
        op:
          enum:
            - or
          type: string
      required:
        - op
        - filters
      type: object
    HomologyFilterNot:
      additionalProperties: false
      properties:
        filter:
          $ref: '#/components/schemas/HomologyDocumentFilter'
        op:
          enum:
            - not
          type: string
      required:
        - op
        - filter
      type: object
    HomologyFilterEq:
      additionalProperties: false
      properties:
        field:
          maxLength: 256
          not:
            enum:
              - id
          pattern: ^[a-z0-9_]+$
          type: string
        op:
          enum:
            - eq
          type: string
        value:
          oneOf:
            - maxLength: 16384
              type: string
            - type: integer
            - type: boolean
      required:
        - op
        - field
        - value
      type: object
    HomologyFilterIn:
      additionalProperties: false
      properties:
        field:
          maxLength: 256
          not:
            enum:
              - id
          pattern: ^[a-z0-9_]+$
          type: string
        op:
          enum:
            - in
          type: string
        values:
          items:
            oneOf:
              - maxLength: 16384
                type: string
              - type: integer
              - type: boolean
          maxItems: 4096
          minItems: 1
          type: array
      required:
        - op
        - field
        - values
      type: object
    HomologyFilterLt:
      additionalProperties: false
      properties:
        field:
          maxLength: 256
          not:
            enum:
              - id
          pattern: ^[a-z0-9_]+$
          type: string
        op:
          enum:
            - lt
          type: string
        value:
          type: integer
      required:
        - op
        - field
        - value
      type: object
    HomologyFilterLte:
      additionalProperties: false
      properties:
        field:
          maxLength: 256
          not:
            enum:
              - id
          pattern: ^[a-z0-9_]+$
          type: string
        op:
          enum:
            - lte
          type: string
        value:
          type: integer
      required:
        - op
        - field
        - value
      type: object
    HomologyFilterGt:
      additionalProperties: false
      properties:
        field:
          maxLength: 256
          not:
            enum:
              - id
          pattern: ^[a-z0-9_]+$
          type: string
        op:
          enum:
            - gt
          type: string
        value:
          type: integer
      required:
        - op
        - field
        - value
      type: object
    HomologyFilterGte:
      additionalProperties: false
      properties:
        field:
          maxLength: 256
          not:
            enum:
              - id
          pattern: ^[a-z0-9_]+$
          type: string
        op:
          enum:
            - gte
          type: string
        value:
          type: integer
      required:
        - op
        - field
        - value
      type: object
    HomologyFilterContains:
      additionalProperties: false
      properties:
        field:
          maxLength: 256
          not:
            enum:
              - id
          pattern: ^[a-z0-9_]+$
          type: string
        op:
          enum:
            - contains
          type: string
        value:
          maxLength: 16384
          type: string
      required:
        - op
        - field
        - value
      type: object
    HomologyFilterContainsAny:
      additionalProperties: false
      properties:
        field:
          maxLength: 256
          not:
            enum:
              - id
          pattern: ^[a-z0-9_]+$
          type: string
        op:
          enum:
            - contains_any
          type: string
        values:
          items:
            maxLength: 16384
            type: string
          maxItems: 4096
          minItems: 1
          type: array
      required:
        - op
        - field
        - values
      type: object
    HomologyFilterContainsAll:
      additionalProperties: false
      properties:
        field:
          maxLength: 256
          not:
            enum:
              - id
          pattern: ^[a-z0-9_]+$
          type: string
        op:
          enum:
            - contains_all
          type: string
        values:
          items:
            maxLength: 16384
            type: string
          maxItems: 4096
          minItems: 1
          type: array
      required:
        - op
        - field
        - values
      type: object
    HomologyFilterExists:
      additionalProperties: false
      properties:
        field:
          maxLength: 256
          not:
            enum:
              - id
          pattern: ^[a-z0-9_]+$
          type: string
        op:
          enum:
            - exists
          type: string
        value:
          type: boolean
      required:
        - op
        - field
        - value
      type: object
  securitySchemes:
    bearerAuth:
      description: 'A Rafflesia API key, sent as `Authorization: Bearer <key>`.'
      scheme: bearer
      type: http

````