> ## Documentation Index > Fetch the complete documentation index at: https://help.withallo.com/llms.txt > Use this file to discover all available pages before exploring further. # Update call summary > Replace the markdown content of a call's AI-generated summary. Only call items have summaries — passing an SMS ID (`msg-*`) returns `400 INVALID_ITEM_ID`. If multiple completed summary templates exist on the same call, set `template_key` to disambiguate. **Required scope:** `CONVERSATIONS_WRITE` Use this endpoint to replace the markdown body of a call's AI-generated summary — for example, after an agent reviews the auto-generated text and corrects it. Only call items have summaries. Passing an SMS ID (`msg-*`) returns `400 INVALID_ITEM_ID`. ## Choosing a template Most calls have a single completed summary, so `template_key` can be omitted. When a call has more than one completed summary (e.g., both `MARKDOWN_CLASSIC` and `MARKDOWN_SHORT_CALL`), `template_key` is **required** — otherwise the request fails with `400 SUMMARY_TEMPLATE_KEY_REQUIRED`. | Template | Use case | | --------------------- | ------------------------------------- | | `MARKDOWN_CLASSIC` | Full structured summary with sections | | `MARKDOWN_SHORT_CALL` | One-paragraph summary for short calls | If the call has no completed summary matching the supplied `template_key`, the request returns `404 SUMMARY_TEMPLATE_NOT_FOUND`. ## Error codes | Code | Status | When | | ------------------------------- | ------ | ------------------------------------------------------------------------ | | `INVALID_ITEM_ID` | 400 | The ID prefix isn't `cll-` | | `INVALID_REQUEST_BODY` | 400 | `content` is missing or exceeds 100,000 characters | | `SUMMARY_TEMPLATE_KEY_REQUIRED` | 400 | The call has multiple completed templates and `template_key` was omitted | | `CONVERSATION_ITEM_NOT_FOUND` | 404 | The call doesn't exist or the API key's owner has no access to it | | `SUMMARY_TEMPLATE_NOT_FOUND` | 404 | No completed summary exists for the requested `template_key` | ## OpenAPI ````yaml PATCH /v2/api/conversations/items/{id}/summary openapi: 3.0.3 info: title: Allo API description: >- Allo API provides programmatic access to your Allo account, allowing you to manage webhooks, retrieve calls and contacts, and send SMS messages. All requests to `/v1/api/**` endpoints automatically go through quota checking and scope validation. version: 1.0.0 contact: name: Allo Support servers: - url: https://api.withallo.com description: Production server security: [] tags: - name: Summary Templates description: >- Manage call summary templates that control how AI-generated call summaries are structured for your team. - name: Webhooks description: >- Manage webhook configurations to receive real-time notifications about events in your Allo account. Each webhook is associated with a specific Allo phone number. - name: Calls description: >- Retrieve and search call records with filtering and pagination. Filter calls by your Allo phone number. - name: Contacts description: >- Search and retrieve contact information with sorting and pagination. Includes engagement level tracking. - name: SMS description: Send SMS messages to phone numbers using your Allo numbers. - name: Phone Numbers description: Retrieve information about your Allo phone numbers. - name: Analytics description: Pre-computed call metrics, team performance, and outbound dial funnel - name: CRM description: Manage people, companies, and deals in your CRM. paths: /v2/api/conversations/items/{id}/summary: patch: tags: - Conversations summary: Update call summary description: >- Replace the markdown content of a call's AI-generated summary. Only call items have summaries — passing an SMS ID (`msg-*`) returns `400 INVALID_ITEM_ID`. If multiple completed summary templates exist on the same call, set `template_key` to disambiguate. operationId: updateCallSummary parameters: - name: id in: path required: true description: Call ID (`cll-*`) schema: type: string example: cll-abc123 requestBody: required: true content: application/json: schema: type: object properties: content: type: string description: Full replacement markdown content. Max 100,000 characters. maxLength: 100000 template_key: type: string nullable: true enum: - MARKDOWN_CLASSIC - MARKDOWN_SHORT_CALL description: >- Required only when the call has more than one completed summary template. required: - content example: content: >- # Summary Customer asked about pricing for the Pro plan and confirmed a follow-up call next Tuesday. responses: '200': description: Updated summary content: application/json: schema: type: object properties: data: $ref: '#/components/schemas/CallSummary' example: data: id: cll-abc123 content: >- # Summary Customer asked about pricing for the Pro plan and confirmed a follow-up call next Tuesday. version: 4 updated_at: '2026-05-12T14:32:11' updated_by: id: usr-abc123 name: Alex Kim '400': $ref: '#/components/responses/ApiValidationError' '401': $ref: '#/components/responses/ApiUnauthorized' '404': $ref: '#/components/responses/ApiNotFound' '429': $ref: '#/components/responses/ApiRateLimited' security: - ApiKeyAuth: [] components: schemas: CallSummary: type: object properties: id: type: string description: Call ID this summary belongs to example: cll-abc123 content: type: string nullable: true description: Markdown summary content version: type: integer format: int64 description: Optimistic-lock version. Increments on every successful update. example: 4 updated_at: type: string format: date-time nullable: true example: '2026-05-12T14:32:11' updated_by: type: object nullable: true properties: id: type: string example: usr-abc123 name: type: string nullable: true example: Alex Kim ApiError: type: object properties: error: type: object properties: type: type: string code: type: string message: type: string retryable: type: boolean request_id: type: string retry_after_seconds: type: integer nullable: true responses: ApiValidationError: description: Invalid request parameters content: application/json: schema: $ref: '#/components/schemas/ApiError' ApiUnauthorized: description: Invalid or missing API key content: application/json: schema: $ref: '#/components/schemas/ApiError' ApiNotFound: description: Resource not found content: application/json: schema: $ref: '#/components/schemas/ApiError' ApiRateLimited: description: Rate limit exceeded content: application/json: schema: $ref: '#/components/schemas/ApiError' securitySchemes: ApiKeyAuth: type: apiKey in: header name: Authorization ````