> ## Documentation Index > Fetch the complete documentation index at: https://docs.fuseai.com/llms.txt > Use this file to discover all available pages before exploring further. # Rebuild the AI topic plan across the campaign's steps > Rebuilds the AI topic plan across the campaign's `ai_generated` steps in one pass, so the sequence reads as one narrative instead of a set of independently written steps. Manual steps are left alone, which is why `regeneratedStepCount` can be smaller than `totalStepCount`. It rewrites step topics and titles only - queued sends already created are not rewritten. Only the token owner's own campaigns can be regenerated: a campaign delegated to you, one shared by your team's visibility settings, and a deleted one all answer 404. Rate limit: this endpoint has a tighter cap of 10 requests/minute and 100/day, applied inside the shared campaigns bucket of 30 requests/minute and 1,000/day per token owner (shared by every campaign, scheduled-send, campaign-template and knowledge-hub endpoint). Errors: - `404` `CAMPAIGN_NOT_FOUND` — No campaign with this id exists, it belongs to another account (including a campaign delegated to you or shared by your team's visibility settings), or it has been deleted. - `422` `VALIDATION_FAILED` — campaignId is not a 24-character hex id. - `429` `RATE_LIMITED` — Either this endpoint's own cap (10 requests/minute, 100/day) or the shared campaigns bucket (30/minute, 1,000/day for this token owner, shared by every /business/campaigns, /business/scheduled-sends, /business/campaign-templates and /business/knowledge-hubs call) was exceeded. The RateLimit-* headers on the response describe the shared bucket, so a refusal from this endpoint's own cap can still report requests remaining and carries no Retry-After. - `500` `UNEXPECTED_ERROR` — Topic generation failed; the detail stays in our logs. Requires one of the following token scopes: campaigns. ## OpenAPI ````yaml /openapi.json post /business/campaigns/{campaignId}/steps/regenerate-topics openapi: 3.1.0 info: title: Fuse Business API version: 1.0.0 description: >- External API for lists, campaigns, prospect search and contacts. Authenticate with your API token as HTTP Basic. All paths are under /api/v1. servers: - url: https://api.tryfuse.ai/api/v1 description: Production security: - basicAuth: [] tags: - name: Lists - name: Custom columns - name: Smart columns - name: Exports - name: Campaigns - name: Knowledge hubs - name: Analytics - name: Website intent - name: Account - name: Prospect search - name: Campaign steps - name: Scheduled sends - name: Campaign templates - name: Agents - name: Research - name: Company search - name: Saved searches - name: Folders - name: Contacts paths: /business/campaigns/{campaignId}/steps/regenerate-topics: post: tags: - Campaign steps summary: Rebuild the AI topic plan across the campaign's steps description: >- Rebuilds the AI topic plan across the campaign's `ai_generated` steps in one pass, so the sequence reads as one narrative instead of a set of independently written steps. Manual steps are left alone, which is why `regeneratedStepCount` can be smaller than `totalStepCount`. It rewrites step topics and titles only - queued sends already created are not rewritten. Only the token owner's own campaigns can be regenerated: a campaign delegated to you, one shared by your team's visibility settings, and a deleted one all answer 404. Rate limit: this endpoint has a tighter cap of 10 requests/minute and 100/day, applied inside the shared campaigns bucket of 30 requests/minute and 1,000/day per token owner (shared by every campaign, scheduled-send, campaign-template and knowledge-hub endpoint). Errors: - `404` `CAMPAIGN_NOT_FOUND` — No campaign with this id exists, it belongs to another account (including a campaign delegated to you or shared by your team's visibility settings), or it has been deleted. - `422` `VALIDATION_FAILED` — campaignId is not a 24-character hex id. - `429` `RATE_LIMITED` — Either this endpoint's own cap (10 requests/minute, 100/day) or the shared campaigns bucket (30/minute, 1,000/day for this token owner, shared by every /business/campaigns, /business/scheduled-sends, /business/campaign-templates and /business/knowledge-hubs call) was exceeded. The RateLimit-* headers on the response describe the shared bucket, so a refusal from this endpoint's own cap can still report requests remaining and carries no Retry-After. - `500` `UNEXPECTED_ERROR` — Topic generation failed; the detail stays in our logs. Requires one of the following token scopes: campaigns. operationId: regenerateCampaignStepTopics parameters: - name: campaignId in: path required: true description: >- The campaign's id (24-character hex ObjectId), as returned by POST /business/campaigns or as the campaignId of a GET /business/campaigns row. schema: type: string description: >- The campaign's id (24-character hex ObjectId), as returned by POST /business/campaigns or as the campaignId of a GET /business/campaigns row. responses: '200': description: Success headers: RateLimit-Limit: schema: type: integer description: Requests permitted in the current window. RateLimit-Remaining: schema: type: integer description: Requests remaining in the current window. RateLimit-Reset: schema: type: integer description: Seconds until the current window resets. content: application/json: schema: type: object properties: totalStepCount: type: integer description: Sequence steps the campaign has. regeneratedStepCount: type: integer description: >- How many of them got a new topic; 0 when the campaign has no AI steps. required: - totalStepCount - regeneratedStepCount example: totalStepCount: 4 regeneratedStepCount: 3 '400': description: Error content: application/json: schema: $ref: '#/components/schemas/Error' '401': description: Error content: application/json: schema: $ref: '#/components/schemas/Error' '402': description: Error content: application/json: schema: $ref: '#/components/schemas/Error' '403': description: Error content: application/json: schema: $ref: '#/components/schemas/Error' '404': description: Error content: application/json: schema: $ref: '#/components/schemas/Error' '409': description: Error content: application/json: schema: $ref: '#/components/schemas/Error' '422': description: Error content: application/json: schema: $ref: '#/components/schemas/Error' '429': description: Error content: application/json: schema: $ref: '#/components/schemas/Error' '500': description: Error content: application/json: schema: $ref: '#/components/schemas/Error' security: - basicAuth: [] components: schemas: Error: type: object properties: error: type: object properties: code: type: string message: type: string param: type: - string - 'null' doc_url: type: - string - 'null' request_id: type: - string - 'null' required: - code - message required: - error securitySchemes: basicAuth: type: http scheme: basic description: >- Your API token (`af_…`) as the Basic-auth username, with an empty password. ````