> ## Documentation Index > Fetch the complete documentation index at: https://docs.prisme.ai/llms.txt > Use this file to discover all available pages before exploring further. # Change a principal's role > Requires `admin`+ (or owner). ## OpenAPI ````yaml /api-reference/storage/swagger.yml patch /v1/knowledge_bases/{knowledgeBaseId}/access/{principalType}/{principalId} openapi: 3.0.3 info: version: 1.0.0 title: Knowledges API description: > Public REST API for the Prisme.ai Knowledges (storage) workspace: knowledge bases, documents (uploaded files, web pages, remote files, connector documents), recurring web-crawl sources, semantic search, access control, per-knowledge-base API keys, and skills. Resource identifiers use the physical prefixes emitted by the implementation (`vs_` knowledge base, `vsf_` document, `seed_` web source, `kb-` API-key slug). This spec documents the public REST surface only. Internal helpers (private automations prefixed with `_`) and admin/GDPR lifecycle operations are not part of the public contract. contact: name: Prisme.ai url: https://prisme.ai servers: - url: https://{host}/v2/workspaces/slug:storage/webhooks description: Prisme.ai workspace webhooks variables: host: default: api.studio.prisme.ai description: API host (override for self-hosted or sandbox) security: - BearerAuth: [] - WorkspaceApiKeyAuth: [] tags: - name: Knowledge Bases description: >- Create, list, read, update, and delete knowledge bases (vector-backed document stores). - name: Documents description: >- Ingest and manage documents (uploaded files, web pages, remote files, connector documents) and their indexing. - name: Web Sources description: >- Recurring web crawl seeds that discover and index pages into a knowledge base. - name: Search description: Semantic search over a knowledge base. - name: Access description: Per-knowledge-base access bindings (user, group, org, agent principals). - name: API Keys description: Per-knowledge-base API keys for connector authentication. - name: Stats description: Aggregate dashboard statistics. - name: Skills description: Prompt/instruction registry entries. paths: /v1/knowledge_bases/{knowledgeBaseId}/access/{principalType}/{principalId}: parameters: - name: knowledgeBaseId in: path required: true schema: type: string pattern: ^vs_[A-Za-z0-9-]+$ maxLength: 128 description: >- Knowledge base id. Legacy physical prefix `vs_` (the `kb_` rename is deferred). - name: principalType in: path required: true schema: type: string enum: - user - group - org - agent description: | Type of access principal. `agent` is a first-class owner principal for conversation/agent-owned knowledge bases (§F-6); `principal_id` is then the agent id (or its service-account id). - name: principalId in: path required: true schema: type: string maxLength: 128 description: | Identifier of the principal. For `user`, the user id; for `group` and `org`, the group/org slug or id resolvable by the platform. patch: tags: - Access summary: Change a principal's role description: Requires `admin`+ (or owner). operationId: updateAccessBinding requestBody: required: true content: application/json: schema: type: object required: - role additionalProperties: false properties: role: type: string enum: - admin - editor - reader responses: '200': description: Updated binding. content: application/json: schema: $ref: '#/components/schemas/AccessBinding' '400': $ref: '#/components/responses/Error400' '401': $ref: '#/components/responses/Error401' '403': $ref: '#/components/responses/Error403' '404': $ref: '#/components/responses/Error404' security: - BearerAuth: [] components: schemas: AccessBinding: type: object description: | Per-knowledge-base access binding, persisted in the platform-managed `product_bindings` store (storage owns no bindings collection). Principals: `user`, `group`, `org`, and `agent` - agent ownership is first-class (§F-6). The owner appears as an explicit `role: owner` binding; `admin` / `editor` / `reader` are grantable via the API (owner is not). required: - object - knowledge_base_id - principal_type - principal_id - role - created_at properties: object: type: string enum: - knowledge_base.access_binding knowledge_base_id: type: string pattern: ^vs_[A-Za-z0-9-]+$ principal_type: type: string enum: - user - group - org - agent principal_id: type: string maxLength: 128 role: type: string enum: - owner - admin - editor - reader email: type: string description: Resolved at read time for `user` principals. nullable: true org_slug: type: string nullable: true granted_by: type: string nullable: true created_at: type: integer updated_at: type: integer Error: type: object description: | Single error envelope shared by every non-2xx response. `code` is the stable machine-readable identifier; `message` is the human-readable text; `details` is optional structured context. properties: error: type: object required: - code - message properties: code: type: string example: VALIDATION_ERROR message: type: string details: type: object additionalProperties: true required: - error responses: Error400: description: Caller validation failure. content: application/json: schema: $ref: '#/components/schemas/Error' examples: missing_source: summary: No identifiable source value: error: code: MISSING_SOURCE message: Provide native_file_id, source_url, or fetch_url. conflicting_type: summary: source_type conflicts with native_file_id value: error: code: VALIDATION_ERROR message: >- source_type must be uploaded_file when native_file_id is provided details: field: source_type Error401: description: Authentication missing or invalid. content: application/json: schema: $ref: '#/components/schemas/Error' examples: unauthenticated: value: error: code: UNAUTHENTICATED message: Authentication required. Error403: description: Authentication present, authorization denied. content: application/json: schema: $ref: '#/components/schemas/Error' examples: forbidden: value: error: code: FORBIDDEN message: Caller is not allowed to access this resource. hook_rejected: summary: An external content hook blocked ingestion (sync) value: error: code: HOOK_REJECTED message: Content was rejected by a compliance hook. details: rejected_by: hook_pii_filter rejection_reason: detected_unmasked_pii Error404: description: Resource does not exist or is not visible to the caller. content: application/json: schema: $ref: '#/components/schemas/Error' examples: not_found: value: error: code: NOT_FOUND message: knowledge_base.document not found. details: resource: knowledge_base.document id: vsf_unknown securitySchemes: BearerAuth: type: http scheme: bearer bearerFormat: JWT description: >- User session JWT or instance API key (`iak_*`). Send as `Authorization: Bearer `. WorkspaceApiKeyAuth: type: apiKey in: header name: x-prismeai-api-key description: Workspace- or knowledge-base-scoped API key. ````