> ## Documentation Index > Fetch the complete documentation index at: https://docs.adside.ai/llms.txt > Use this file to discover all available pages before exploring further. # Create Creative > Create a new creative in a campaign. Use content_reference to sponsor an existing post, or inline_content to create a new post and creative in one call. Two ad formats are supported inline: SINGLE_IMAGE (one image, one headline, one destination) and CAROUSEL (two to ten cards, each with its own image, headline and destination, and no call-to-action). The format must match the campaign's — LinkedIn freezes an ad set's format when it is first saved. LinkedIn offers seven other formats we do not model. VOCABULARY: the API's `creative` is what Campaign Manager shows as "Ad" (campaignGroup="Campaign", campaign="Ad set", creative="Ad"). Say both names when reporting to a user, or they will look in the wrong tab and think nothing happened. ## OpenAPI ````yaml /api-reference/openapi.yaml post /linkedin/mcp#create_creative openapi: 3.1.0 info: title: Multi-Source Ads API version: 1.0.0 description: >- Unified API for managing ad campaigns across Meta, LinkedIn, and Google. MCP tools are accessed via JSON-RPC 2.0 over HTTP (`POST /{source}/mcp`). Google Sheets/Drive endpoints use standard REST. servers: - url: https://api.adside.ai description: Production - url: http://localhost:3100 description: Local development security: - bearerAuth: [] tags: - name: Accounts description: '' - name: Ads description: '' - name: Analytics description: '' - name: Asset Groups description: '' - name: Assets description: '' - name: Audiences description: '' - name: Campaign Groups description: '' - name: Campaigns description: '' - name: Conversions description: '' - name: Creatives description: '' - name: Drive description: '' - name: Google description: '' - name: Google Ads description: '' - name: Google Tag Manager description: '' - name: Keywords description: '' - name: Linkedin description: '' - name: Meta description: '' - name: Meta Reporting description: '' - name: OAuth description: '' - name: Other description: '' - name: Reports description: '' - name: Sheets description: '' - name: Targeting description: '' - name: Tiktok description: '' - name: Workspace description: '' paths: /linkedin/mcp#create_creative: post: tags: - Linkedin - Creatives summary: Create Creative description: >- Create a new creative in a campaign. Use content_reference to sponsor an existing post, or inline_content to create a new post and creative in one call. Two ad formats are supported inline: SINGLE_IMAGE (one image, one headline, one destination) and CAROUSEL (two to ten cards, each with its own image, headline and destination, and no call-to-action). The format must match the campaign's — LinkedIn freezes an ad set's format when it is first saved. LinkedIn offers seven other formats we do not model. VOCABULARY: the API's `creative` is what Campaign Manager shows as "Ad" (campaignGroup="Campaign", campaign="Ad set", creative="Ad"). Say both names when reporting to a user, or they will look in the wrong tab and think nothing happened. operationId: linkedin_create_creative requestBody: required: true content: application/json: schema: type: object required: - jsonrpc - method - params properties: jsonrpc: type: string const: '2.0' id: type: string example: '1' method: type: string const: tools/call params: type: object required: - name - arguments properties: name: type: string const: create_creative arguments: $ref: '#/components/schemas/linkedin_create_creative_input' responses: '200': description: JSON-RPC response with tool result content: application/json: schema: $ref: '#/components/schemas/McpToolResponse' '401': description: Missing or invalid API key content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '403': description: Channel not connected or access denied content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '429': description: Rate limit exceeded content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' security: - bearerAuth: [] components: schemas: linkedin_create_creative_input: type: object properties: account_id: description: >- LinkedIn Ad Account ID. Omit it: it defaults to the account this client is connected to, and any other account is refused. type: string campaign_id: type: string description: Campaign ID or URN to associate the creative with intended_status: default: DRAFT description: >- Initial intended status. DRAFT is what 'create without delivering' means here — a creative cannot be born PAUSED (LinkedIn refuses null → PAUSED while review.reviewStatus is unset, measured 2026-08-05). Pause it with update_creative once it has been reviewed. type: string enum: - ACTIVE - DRAFT content_reference: description: >- URN of existing content to sponsor (e.g. urn:li:share:{id} or urn:li:ugcPost:{id}). Use this OR inline_content, not both. type: string inline_content: description: >- Inline content to create a new post and creative in one call. Use this OR content_reference, not both. Pick the `format` branch that matches the campaign's own format: LinkedIn freezes an ad set's format the first time it is saved — 'Your objective and ad format cannot be changed once you save.' oneOf: - type: object properties: format: type: string const: SINGLE_IMAGE description: >- One image (or video), one headline, one destination. The shape Campaign Manager calls a 'Single image' ad. author: type: string description: Author URN (e.g. urn:li:organization:{id}) commentary: type: string description: Post commentary text media_id: description: Media URN (e.g. urn:li:image:{id} or urn:li:video:{id}) type: string minLength: 1 media_title: description: Title for the media type: string alt_text: description: >- Alternate text describing the image, read aloud by screen readers. Recommended under 120 characters. Describe what the image SHOWS — not the brand, not the offer, which the commentary already says. type: string maxLength: 4086 landing_page: description: Landing page URL for click-through type: string call_to_action_label: description: >- Call-to-action button label. The twelve Campaign Manager offers on a single-image ad. Not every format takes one: a carousel has no call-to-action at all under Website visits, a video REQUIRES one, and a spotlight takes free text rather than a label (swept from the UI 2026-08-05). type: string enum: - APPLY - DOWNLOAD - VIEW_QUOTE - LEARN_MORE - SIGN_UP - SUBSCRIBE - REGISTER - REQUEST_DEMO - JOIN - ATTEND - BUY_NOW - SHOP_NOW required: - format - author - commentary - type: object properties: format: type: string const: CAROUSEL description: >- Two to ten swipeable cards, each with its own image, headline and destination. The shape Campaign Manager calls a 'Carousel image' ad. author: type: string description: Author URN (e.g. urn:li:organization:{id}) commentary: type: string description: Post commentary text cards: minItems: 2 maxItems: 10 type: array items: type: object properties: image_id: type: string minLength: 1 description: >- Image URN for this card (urn:li:image:{id}) — get one from upload_image. Cards may repeat the same URN; LinkedIn's own example does. Only images are supported, never video. title: type: string minLength: 1 maxLength: 400 description: >- The card's headline. Required. The API allows 400 characters but Campaign Manager's own editor caps it at 45 (30 when the ad points at a lead gen form) and truncates after two lines — write for 45. landing_page: type: string format: uri description: >- Where this card goes when clicked. Required, and per-card: the whole point of a carousel is that cards can lead to different pages. alt_text: description: >- Alternate text for this card's image, read aloud by screen readers. Describe what the image SHOWS. type: string maxLength: 4086 required: - image_id - title - landing_page description: >- The cards, in display order. Campaign Manager states the bounds as its own spec: 'You must have a minimum of two cards. You cannot have more than 10 cards.' landing_page: description: >- Fallback destination for the ad as a whole (`contentLandingPage`), separate from each card's own. Cards keep their individual links. type: string format: uri required: - format - author - commentary - cards name: description: Creative name for reference type: string leadgen_form_id: description: >- Lead gen form URN (required for LEAD_GENERATION campaigns), e.g. urn:li:adForm:1022720550. Get it from list_lead_gen_forms — the form must already exist on the account, this cannot create one. Measured on 54 live creatives: the URN form is what LinkedIn stores here. type: string leadgen_cta_label: description: >- Call-to-action label for a lead gen form. A different set from `inline_content.call_to_action_label` — do not assume the two lists match. type: string enum: - APPLY - DOWNLOAD - VIEW_QUOTE - LEARN_MORE - SIGN_UP - SUBSCRIBE - REGISTER - REQUEST_DEMO - JOIN - ATTEND required: - campaign_id $schema: http://json-schema.org/draft-07/schema# McpToolResponse: type: object properties: jsonrpc: type: string const: '2.0' id: type: string result: type: object properties: content: type: array items: type: object properties: type: type: string const: text text: type: string description: JSON-stringified tool result ErrorResponse: type: object properties: error: type: string description: Error message code: type: string enum: - UNAUTHORIZED - FORBIDDEN - NOT_FOUND - RATE_LIMITED - INTERNAL_ERROR description: Error code securitySchemes: bearerAuth: type: http scheme: bearer description: >- API key (sk_live_*) — SHA256 hashed, looked up in Redis. Generate via the web app's workspace settings. ````