Letta Identities API

openapi: 3.1.0
info:
  title: Letta Admin Identities API
  version: 1.0.0
  description: REST API for Letta, the stateful agents platform. Manage agents, memory blocks, archival passages, sources, custom tools, MCP servers, multi-agent groups, runs, and streaming responses. Available as Letta Cloud (managed) at https://api.letta.com/v1 and as the self-hosted open-source server (Apache-2.0) typically run at http://localhost:8283.
  contact:
    name: Letta
    url: https://www.letta.com/
    email: support@letta.com
  license:
    name: Apache-2.0
    url: https://github.com/letta-ai/letta/blob/main/LICENSE
  x-logo:
    url: https://www.letta.com/favicon.ico
servers:
- url: https://api.letta.com
  description: Letta Cloud (managed)
- url: https://app.letta.com
  description: Letta Cloud (app)
- url: http://localhost:8283
  description: Self-hosted Letta server
security:
- bearerAuth: []
tags:
- name: Identities
  description: Map external user identities to agents and memory contexts.
paths:
  /v1/identities/:
    get:
      tags:
      - Identities
      summary: List Identities
      description: Get a list of all identities in the database
      operationId: list_identities
      deprecated: true
      parameters:
      - name: name
        in: query
        required: false
        schema:
          anyOf:
          - type: string
          - type: 'null'
          title: Name
      - name: project_id
        in: query
        required: false
        schema:
          anyOf:
          - type: string
          - type: 'null'
          description: '[DEPRECATED: Use X-Project-Id header instead] Filter identities by project ID'
          deprecated: true
          title: Project Id
        description: '[DEPRECATED: Use X-Project-Id header instead] Filter identities by project ID'
        deprecated: true
      - name: identifier_key
        in: query
        required: false
        schema:
          anyOf:
          - type: string
          - type: 'null'
          title: Identifier Key
      - name: identity_type
        in: query
        required: false
        schema:
          anyOf:
          - $ref: '#/components/schemas/IdentityType'
          - type: 'null'
          title: Identity Type
      - name: before
        in: query
        required: false
        schema:
          anyOf:
          - type: string
          - type: 'null'
          description: Identity ID cursor for pagination. Returns identities that come before this identity ID in the specified sort order
          title: Before
        description: Identity ID cursor for pagination. Returns identities that come before this identity ID in the specified sort order
      - name: after
        in: query
        required: false
        schema:
          anyOf:
          - type: string
          - type: 'null'
          description: Identity ID cursor for pagination. Returns identities that come after this identity ID in the specified sort order
          title: After
        description: Identity ID cursor for pagination. Returns identities that come after this identity ID in the specified sort order
      - name: limit
        in: query
        required: false
        schema:
          anyOf:
          - type: integer
          - type: 'null'
          description: Maximum number of identities to return
          default: 50
          title: Limit
        description: Maximum number of identities to return
      - name: order
        in: query
        required: false
        schema:
          enum:
          - asc
          - desc
          type: string
          description: Sort order for identities by creation time. 'asc' for oldest first, 'desc' for newest first
          default: desc
          title: Order
        description: Sort order for identities by creation time. 'asc' for oldest first, 'desc' for newest first
      - name: order_by
        in: query
        required: false
        schema:
          const: created_at
          type: string
          description: Field to sort by
          default: created_at
          title: Order By
        description: Field to sort by
      responses:
        '200':
          description: Successful Response
          content:
            application/json:
              schema:
                type: array
                items:
                  $ref: '#/components/schemas/Identity'
                title: Response List Identities
        '422':
          description: Validation Error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/HTTPValidationError'
    post:
      tags:
      - Identities
      summary: Create Identity
      operationId: create_identity
      deprecated: true
      parameters:
      - name: X-Project
        in: header
        required: false
        schema:
          anyOf:
          - type: string
          - type: 'null'
          description: The project slug to associate with the identity (cloud only).
          title: X-Project
        description: The project slug to associate with the identity (cloud only).
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/IdentityCreate'
      responses:
        '200':
          description: Successful Response
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Identity'
        '422':
          description: Validation Error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/HTTPValidationError'
    put:
      tags:
      - Identities
      summary: Upsert Identity
      operationId: upsert_identity
      deprecated: true
      parameters:
      - name: X-Project
        in: header
        required: false
        schema:
          anyOf:
          - type: string
          - type: 'null'
          description: The project slug to associate with the identity (cloud only).
          title: X-Project
        description: The project slug to associate with the identity (cloud only).
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/IdentityUpsert'
      responses:
        '200':
          description: Successful Response
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Identity'
        '422':
          description: Validation Error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/HTTPValidationError'
  /v1/identities/count:
    get:
      tags:
      - Identities
      summary: Count Identities
      description: Get count of all identities for a user
      operationId: count_identities
      deprecated: true
      parameters: []
      responses:
        '200':
          description: Successful Response
          content:
            application/json:
              schema:
                type: integer
                title: Response Count Identities
        '422':
          description: Validation Error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/HTTPValidationError'
  /v1/identities/{identity_id}:
    get:
      tags:
      - Identities
      summary: Retrieve Identity
      operationId: retrieve_identity
      deprecated: true
      parameters:
      - name: identity_id
        in: path
        required: true
        schema:
          type: string
          minLength: 45
          maxLength: 45
          pattern: ^identity-[0-9a-f]{8}-[0-9a-f]{4}-4[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$
          description: The ID of the identity in the format 'identity-<uuid4>'
          examples:
          - identity-123e4567-e89b-42d3-8456-426614174000
          title: Identity Id
        description: The ID of the identity in the format 'identity-<uuid4>'
      responses:
        '200':
          description: Successful Response
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Identity'
        '422':
          description: Validation Error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/HTTPValidationError'
    patch:
      tags:
      - Identities
      summary: Modify Identity
      operationId: update_identity
      deprecated: true
      parameters:
      - name: identity_id
        in: path
        required: true
        schema:
          type: string
          minLength: 45
          maxLength: 45
          pattern: ^identity-[0-9a-f]{8}-[0-9a-f]{4}-4[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$
          description: The ID of the identity in the format 'identity-<uuid4>'
          examples:
          - identity-123e4567-e89b-42d3-8456-426614174000
          title: Identity Id
        description: The ID of the identity in the format 'identity-<uuid4>'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/IdentityUpdate'
      responses:
        '200':
          description: Successful Response
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Identity'
        '422':
          description: Validation Error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/HTTPValidationError'
    delete:
      tags:
      - Identities
      summary: Delete Identity
      description: Delete an identity by its identifier key
      operationId: delete_identity
      deprecated: true
      parameters:
      - name: identity_id
        in: path
        required: true
        schema:
          type: string
          minLength: 45
          maxLength: 45
          pattern: ^identity-[0-9a-f]{8}-[0-9a-f]{4}-4[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$
          description: The ID of the identity in the format 'identity-<uuid4>'
          examples:
          - identity-123e4567-e89b-42d3-8456-426614174000
          title: Identity Id
        description: The ID of the identity in the format 'identity-<uuid4>'
      responses:
        '200':
          description: Successful Response
          content:
            application/json:
              schema: {}
        '422':
          description: Validation Error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/HTTPValidationError'
  /v1/identities/{identity_id}/properties:
    put:
      tags:
      - Identities
      summary: Upsert Properties for Identity
      operationId: upsert_properties_for_identity
      deprecated: true
      parameters:
      - name: identity_id
        in: path
        required: true
        schema:
          type: string
          minLength: 45
          maxLength: 45
          pattern: ^identity-[0-9a-f]{8}-[0-9a-f]{4}-4[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$
          description: The ID of the identity in the format 'identity-<uuid4>'
          examples:
          - identity-123e4567-e89b-42d3-8456-426614174000
          title: Identity Id
        description: The ID of the identity in the format 'identity-<uuid4>'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: array
              items:
                $ref: '#/components/schemas/IdentityProperty'
              title: Properties
      responses:
        '200':
          description: Successful Response
          content:
            application/json:
              schema: {}
        '422':
          description: Validation Error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/HTTPValidationError'
  /v1/identities/{identity_id}/agents:
    get:
      tags:
      - Identities
      summary: List Agents for Identity
      description: Get all agents associated with the specified identity.
      operationId: list_agents_for_identity
      deprecated: true
      parameters:
      - name: identity_id
        in: path
        required: true
        schema:
          type: string
          minLength: 45
          maxLength: 45
          pattern: ^identity-[0-9a-f]{8}-[0-9a-f]{4}-4[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$
          description: The ID of the identity in the format 'identity-<uuid4>'
          examples:
          - identity-123e4567-e89b-42d3-8456-426614174000
          title: Identity Id
        description: The ID of the identity in the format 'identity-<uuid4>'
      - name: before
        in: query
        required: false
        schema:
          anyOf:
          - type: string
          - type: 'null'
          description: Agent ID cursor for pagination. Returns agents that come before this agent ID in the specified sort order
          title: Before
        description: Agent ID cursor for pagination. Returns agents that come before this agent ID in the specified sort order
      - name: after
        in: query
        required: false
        schema:
          anyOf:
          - type: string
          - type: 'null'
          description: Agent ID cursor for pagination. Returns agents that come after this agent ID in the specified sort order
          title: After
        description: Agent ID cursor for pagination. Returns agents that come after this agent ID in the specified sort order
      - name: limit
        in: query
        required: false
        schema:
          anyOf:
          - type: integer
          - type: 'null'
          description: Maximum number of agents to return
          default: 50
          title: Limit
        description: Maximum number of agents to return
      - name: order
        in: query
        required: false
        schema:
          enum:
          - asc
          - desc
          type: string
          description: Sort order for agents by creation time. 'asc' for oldest first, 'desc' for newest first
          default: desc
          title: Order
        description: Sort order for agents by creation time. 'asc' for oldest first, 'desc' for newest first
      - name: order_by
        in: query
        required: false
        schema:
          const: created_at
          type: string
          description: Field to sort by
          default: created_at
          title: Order By
        description: Field to sort by
      - name: include
        in: query
        required: false
        schema:
          type: array
          items:
            enum:
            - agent.blocks
            - agent.identities
            - agent.managed_group
            - agent.pending_approval
            - agent.secrets
            - agent.sources
            - agent.tags
            - agent.tools
            type: string
          description: Specify which relational fields to include in the response. No relationships are included by default.
          default: []
          title: Include
        description: Specify which relational fields to include in the response. No relationships are included by default.
      responses:
        '200':
          description: Successful Response
          content:
            application/json:
              schema:
                type: array
                items:
                  $ref: '#/components/schemas/AgentState'
                title: Response List Agents For Identity
        '422':
          description: Validation Error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/HTTPValidationError'
  /v1/identities/{identity_id}/blocks:
    get:
      tags:
      - Identities
      summary: List Blocks for Identity
      description: Get all blocks associated with the specified identity.
      operationId: list_blocks_for_identity
      deprecated: true
      parameters:
      - name: identity_id
        in: path
        required: true
        schema:
          type: string
          minLength: 45
          maxLength: 45
          pattern: ^identity-[0-9a-f]{8}-[0-9a-f]{4}-4[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$
          description: The ID of the identity in the format 'identity-<uuid4>'
          examples:
          - identity-123e4567-e89b-42d3-8456-426614174000
          title: Identity Id
        description: The ID of the identity in the format 'identity-<uuid4>'
      - name: before
        in: query
        required: false
        schema:
          anyOf:
          - type: string
          - type: 'null'
          description: Block ID cursor for pagination. Returns blocks that come before this block ID in the specified sort order
          title: Before
        description: Block ID cursor for pagination. Returns blocks that come before this block ID in the specified sort order
      - name: after
        in: query
        required: false
        schema:
          anyOf:
          - type: string
          - type: 'null'
          description: Block ID cursor for pagination. Returns blocks that come after this block ID in the specified sort order
          title: After
        description: Block ID cursor for pagination. Returns blocks that come after this block ID in the specified sort order
      - name: limit
        in: query
        required: false
        schema:
          anyOf:
          - type: integer
          - type: 'null'
          description: Maximum number of blocks to return
          default: 50
          title: Limit
        description: Maximum number of blocks to return
      - name: order
        in: query
        required: false
        schema:
          enum:
          - asc
          - desc
          type: string
          description: Sort order for blocks by creation time. 'asc' for oldest first, 'desc' for newest first
          default: desc
          title: Order
        description: Sort order for blocks by creation time. 'asc' for oldest first, 'desc' for newest first
      - name: order_by
        in: query
        required: false
        schema:
          const: created_at
          type: string
          description: Field to sort by
          default: created_at
          title: Order By
        description: Field to sort by
      responses:
        '200':
          description: Successful Response
          content:
            application/json:
              schema:
                type: array
                items:
                  $ref: '#/components/schemas/BlockResponse'
                title: Response List Blocks For Identity
        '422':
          description: Validation Error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/HTTPValidationError'
components:
  schemas:
    JsonObjectResponseFormat:
      properties:
        type:
          type: string
          const: json_object
          title: Type
          description: The type of the response format.
          default: json_object
      type: object
      title: JsonObjectResponseFormat
      description: Response format for JSON object responses.
    BlockResponse:
      properties:
        value:
          type: string
          title: Value
          description: Value of the block.
        limit:
          type: integer
          title: Limit
          description: Character limit of the block.
          default: 100000
        project_id:
          anyOf:
          - type: string
          - type: 'null'
          title: Project Id
          description: The associated project id.
        template_name:
          anyOf:
          - type: string
          - type: 'null'
          title: Template Name
          description: (Deprecated) The name of the block template (if it is a template).
          deprecated: true
        is_template:
          type: boolean
          title: Is Template
          description: Whether the block is a template (e.g. saved human/persona options).
          default: false
        template_id:
          anyOf:
          - type: string
          - type: 'null'
          title: Template Id
          description: (Deprecated) The id of the template.
          deprecated: true
        base_template_id:
          anyOf:
          - type: string
          - type: 'null'
          title: Base Template Id
          description: (Deprecated) The base template id of the block.
          deprecated: true
        deployment_id:
          anyOf:
          - type: string
          - type: 'null'
          title: Deployment Id
          description: (Deprecated) The id of the deployment.
          deprecated: true
        entity_id:
          anyOf:
          - type: string
          - type: 'null'
          title: Entity Id
          description: (Deprecated) The id of the entity within the template.
          deprecated: true
        preserve_on_migration:
          anyOf:
          - type: boolean
          - type: 'null'
          title: Preserve On Migration
          description: (Deprecated) Preserve the block on template migration.
          default: false
          deprecated: true
        label:
          anyOf:
          - type: string
          - type: 'null'
          title: Label
          description: Label of the block (e.g. 'human', 'persona') in the context window.
        read_only:
          type: boolean
          title: Read Only
          description: (Deprecated) Whether the agent has read-only access to the block.
          default: false
          deprecated: true
        description:
          anyOf:
          - type: string
          - type: 'null'
          title: Description
          description: Description of the block.
        metadata:
          anyOf:
          - additionalProperties: true
            type: object
          - type: 'null'
          title: Metadata
          description: Metadata of the block.
          default: {}
        hidden:
          anyOf:
          - type: boolean
          - type: 'null'
          title: Hidden
          description: (Deprecated) If set to True, the block will be hidden.
          deprecated: true
        id:
          type: string
          title: Id
          description: The id of the block.
        created_by_id:
          anyOf:
          - type: string
          - type: 'null'
          title: Created By Id
          description: The id of the user that made this Block.
        last_updated_by_id:
          anyOf:
          - type: string
          - type: 'null'
          title: Last Updated By Id
          description: The id of the user that last updated this Block.
        tags:
          anyOf:
          - items:
              type: string
            type: array
          - type: 'null'
          title: Tags
          description: The tags associated with the block.
          default: []
      type: object
      required:
      - value
      - id
      title: BlockResponse
    GoogleAIModelSettings:
      properties:
        max_output_tokens:
          type: integer
          title: Max Output Tokens
          description: The maximum number of tokens the model can generate.
          default: 65536
        parallel_tool_calls:
          type: boolean
          title: Parallel Tool Calls
          description: Whether to enable parallel tool calling.
          default: true
        provider_type:
          type: string
          const: google_ai
          title: Provider Type
          description: The type of the provider.
          default: google_ai
        temperature:
          type: number
          title: Temperature
          description: The temperature of the model.
          default: 0.7
        thinking_config:
          $ref: '#/components/schemas/GeminiThinkingConfig'
          description: The thinking configuration for the model.
          default:
            include_thoughts: true
            thinking_budget: 1024
        response_schema:
          anyOf:
          - oneOf:
            - $ref: '#/components/schemas/TextResponseFormat'
            - $ref: '#/components/schemas/JsonSchemaResponseFormat'
            - $ref: '#/components/schemas/JsonObjectResponseFormat'
            discriminator:
              propertyName: type
              mapping:
                json_object: '#/components/schemas/JsonObjectResponseFormat'
                json_schema: '#/components/schemas/JsonSchemaResponseFormat'
                text: '#/components/schemas/TextResponseFormat'
          - type: 'null'
          title: Response Schema
          description: The response schema for the model.
      type: object
      title: GoogleAIModelSettings
    StopReasonType:
      type: string
      enum:
      - end_turn
      - error
      - llm_api_error
      - invalid_llm_response
      - invalid_tool_call
      - max_steps
      - max_tokens_exceeded
      - no_tool_call
      - tool_rule
      - cancelled
      - insufficient_credits
      - requires_approval
      - context_window_overflow_in_system_prompt
      title: StopReasonType
    Tool:
      properties:
        id:
          type: string
          pattern: ^tool-[a-fA-F0-9]{8}
          title: Id
          description: The human-friendly ID of the Tool
          examples:
          - tool-123e4567-e89b-12d3-a456-426614174000
        tool_type:
          $ref: '#/components/schemas/ToolType'
          description: The type of the tool.
          default: custom
        description:
          anyOf:
          - type: string
          - type: 'null'
          title: Description
          description: The description of the tool.
        source_type:
          anyOf:
          - type: string
          - type: 'null'
          title: Source Type
          description: The type of the source code.
        name:
          anyOf:
          - type: string
          - type: 'null'
          title: Name
          description: The name of the function.
        tags:
          items:
            type: string
          type: array
          title: Tags
          description: Metadata tags.
          default: []
        source_code:
          anyOf:
          - type: string
          - type: 'null'
          title: Source Code
          description: The source code of the function.
        json_schema:
          anyOf:
          - additionalProperties: true
            type: object
          - type: 'null'
          title: Json Schema
          description: The JSON schema of the function.
        args_json_schema:
          anyOf:
          - additionalProperties: true
            type: object
          - type: 'null'
          title: Args Json Schema
          description: The args JSON schema of the function.
        return_char_limit:
          type: integer
          maximum: 1000000
          minimum: 1
          title: Return Char Limit
          description: The maximum number of characters in the response.
          default: 50000
        pip_requirements:
          anyOf:
          - items:
              $ref: '#/components/schemas/PipRequirement'
            type: array
          - type: 'null'
          title: Pip Requirements
          description: Optional list of pip packages required by this tool.
        npm_requirements:
          anyOf:
          - items:
              $ref: '#/components/schemas/NpmRequirement'
            type: array
          - type: 'null'
          title: Npm Requirements
          description: Optional list of npm packages required by this tool.
        default_requires_approval:
          anyOf:
          - type: boolean
          - type: 'null'
          title: Default Requires Approval
          description: Default value for whether or not executing this tool requires approval.
        enable_parallel_execution:
          anyOf:
          - type: boolean
          - type: 'null'
          title: Enable Parallel Execution
          description: If set to True, then this tool will potentially be executed concurrently with other tools. Default False.
          default: false
        created_by_id:
          anyOf:
          - type: string
          - type: 'null'
          title: Created By Id
          description: The id of the user that made this Tool.
        last_updated_by_id:
          anyOf:
          - type: string
          - type: 'null'
          title: Last Updated By Id
          description: The id of the user that made this Tool.
        metadata_:
          anyOf:
          - additionalProperties: true
            type: object
          - type: 'null'
          title: Metadata
          description: A dictionary of additional metadata for the tool.
        project_id:
          anyOf:
          - type: string
          - type: 'null'
          title: Project Id
          description: The project id of the tool.
      additionalProperties: false
      type: object
      title: Tool
      description: Representation of a tool, which is a function that can be called by the agent.
    IdentityUpdate:
      properties:
        identifier_key:
          anyOf:
          - type: string
          - type: 'null'
          title: Identifier Key
          description: External, user-generated identifier key of the identity.
        name:
          anyOf:
          - type: string
          - type: 'null'
          title: Name
          description: The name of the identity.
        identity_type:
          anyOf:
          - $ref: '#/components/schemas/IdentityType'
          - type: 'null'
          description: The type of the identity.
        agent_ids:
          anyOf:
          - items:
              type: string
              maxLength: 42
              minLength: 42
              pattern: ^agent-[0-9a-f]{8}-[0-9a-f]{4}-4[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$
              description: The ID of the agent in the format 'agent-<uuid4>'
              examples:
              - agent-123e4567-e89b-42d3-8456-426614174000
            type: array
          - type: 'null'
          title: Agent Ids
          description: The agent ids that are associated with the identity.
          deprecated: true
        block_ids:
          anyOf:
          - items:
              type: string
              maxLength: 42
              minLength: 42
              pattern: ^block-[0-9a-f]{8}-[0-9a-f]{4}-4[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$
              description: The ID of the block in the format 'block-<uuid4>'
              examples:
              - block-123e4567-e89b-42d3-8456-426614174000
            type: array
          - type: 'null'
          title: Block Ids
          description: The IDs of the blocks associated with the identity.
          deprecated: true
        properties:
          anyOf:
          - items:
              $ref: '#/components/schemas/IdentityProperty'
            type: array
          - type: 'null'
          title: Properties
          description: List of properties associated with the identity.
      additionalProperties: false
      type: object
      title: IdentityUpdate
    IdentityCreate:
      properties:
        identifier_key:
          type: string
          title: Identifier Key
          description: External, user-generated identifier key of the identity.
        name:
          type: string
          title: Name
          description: The name of the identity.
        identity_type:
          $ref: '#/components/schemas/IdentityType'
          description: The type of the identity.
        project_id:
          anyOf:
          - type: string
          - type: 'null'
          title: Project Id
          description: The project id of the identity, if applicable.
        agent_ids:
          anyOf:
          - items:
              type: string
              maxLength: 42
              minLength: 42
              pattern: ^agent-[0-9a-f]{8}-[0-9a-f]{4}-4[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$
              description: The ID of the agent in the format 'agent-<uuid4>'
              examples:
              - agent-123e4567-e89b-42d3-8456-426614174000
            type: array
          - type: 'null'
          title: Agent Ids
          description: The agent ids that are associated with the identity.
          deprecated: true
        block_ids:
          anyOf:
          - items:
              type: string
              maxLength: 42
              minLength: 42
              pattern: ^block-[0-9a-f]{8}-[0-9a-f]{4}-4[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$
              description: The ID of the block in the format 'block-

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