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

# Write a brain page

> Save the next version of a writable page. Writable pages are the playbooks (`Playbooks/Positioning`, `ICP`, `Market`, `Distribution`, `Pricing`), `Decisions`, `Playbooks/Competitors/<name>`, `Working Documents/<name>`, and `Archive/<name>`.

Saves the next version of a page. `markdown` replaces the whole page.

You can write the playbooks (`Playbooks/Positioning`, `Playbooks/ICP`, `Playbooks/Market`, `Playbooks/Distribution`, `Playbooks/Pricing`), `Decisions`, `Playbooks/Competitors/<name>`, `Working Documents/<name>`, and `Archive/<name>`. Other pages are built from the rest of the brain and return `400 path_not_writable`.


## OpenAPI

````yaml PUT /v2/brain/page
openapi: 3.1.0
info:
  title: OpenNous REST API
  version: 2.0.0
  description: >-
    Read and write the OpenNous revenue context graph over HTTP. Authenticate
    with a workspace API key.
servers:
  - url: https://api.opennous.cloud
    description: OpenNous Cloud
security:
  - bearerAuth: []
  - apiKeyHeader: []
tags:
  - name: People
  - name: Accounts
  - name: Deals
  - name: Notes
  - name: Attention
  - name: Insights
  - name: Enrich & score
  - name: Organization
  - name: Workflows
  - name: Webhooks
    description: >-
      Subscribe to events and have them pushed to your own stack, with the
      account record attached.
  - name: Usage
paths:
  /v2/brain/page:
    put:
      tags:
        - Organization
      summary: Write a brain page
      description: >-
        Save the next version of a writable page. Writable pages are the
        playbooks (`Playbooks/Positioning`, `ICP`, `Market`, `Distribution`,
        `Pricing`), `Decisions`, `Playbooks/Competitors/<name>`, `Working
        Documents/<name>`, and `Archive/<name>`.
      operationId: writeBrainPage
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
                - path
                - markdown
              properties:
                path:
                  type: string
                markdown:
                  type: string
                  description: The whole page. Replaces the current version.
            example:
              path: Playbooks/Competitors/Clay
              markdown: |-
                # Clay

                Where we win: ...
      responses:
        '201':
          description: Saved.
          content:
            application/json:
              schema:
                type: object
                properties:
                  path:
                    type: string
                  version:
                    type:
                      - integer
                      - 'null'
                  url:
                    type: string
              example:
                path: Playbooks/Competitors/Clay
                version: 2
                url: >-
                  https://app.opennous.cloud/brain/gtm/Playbooks/Competitors/Clay
        '400':
          description: Missing fields, or a page that cannot be written.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
              examples:
                path_required:
                  summary: path_required
                  value:
                    error: path_required
                markdown_required:
                  summary: markdown_required
                  value:
                    error: markdown_required
                path_not_writable:
                  summary: path_not_writable
                  value:
                    error: path_not_writable
                    detail: >-
                      Customer insights live on the Insights page, not in the
                      brain; the extractor writes them from calls.
        '401':
          $ref: '#/components/responses/Unauthorized'
        '402':
          $ref: '#/components/responses/UpgradeRequired'
        '403':
          $ref: '#/components/responses/ReadOnlyKey'
        '429':
          $ref: '#/components/responses/RateLimited'
        '500':
          $ref: '#/components/responses/InternalError'
components:
  schemas:
    Error:
      type: object
      description: >-
        Every error response. `error` is a stable machine code. Some errors add
        fields such as `detail`, `supported`, `max`, or `reason`.
      required:
        - error
      properties:
        error:
          type: string
          description: Machine-readable error code.
        detail:
          type: string
          description: Human-readable explanation, when there is one.
      additionalProperties: true
  responses:
    Unauthorized:
      description: Missing, unknown, or expired API key.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
          examples:
            missing:
              summary: api_key_required
              value:
                error: api_key_required
            invalid:
              summary: invalid_api_key
              value:
                error: invalid_api_key
            expired:
              summary: api_key_expired
              value:
                error: api_key_expired
                detail: >-
                  This API key has expired. Create or rotate a key to get a
                  fresh one.
    UpgradeRequired:
      description: The workspace is past its monthly operations limit and grace window.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
          example:
            error: upgrade_required
            reason: ops_limit_reached
            current_plan: starter
            upgrade_url: /settings?section=billing
    ReadOnlyKey:
      description: A read-only key called a write endpoint.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
          example:
            error: read_only_key
            detail: >-
              This API key is read-only — it can read context but cannot record,
              modify, connect, or send. Use a read/write key for write
              operations.
    RateLimited:
      description: More than 600 requests in a minute on this key.
      headers:
        RateLimit-Limit:
          schema:
            type: integer
          description: Requests allowed per window.
        RateLimit-Remaining:
          schema:
            type: integer
          description: Requests left in the window.
        RateLimit-Reset:
          schema:
            type: integer
          description: Seconds until the window resets.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
          example:
            error: rate_limited
    InternalError:
      description: Unexpected server error.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
          example:
            error: internal_error
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      description: Workspace API key. Create one in **Settings → API keys**.
    apiKeyHeader:
      type: apiKey
      in: header
      name: X-API-Key
      description: The same key, sent as a header.

````

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