> ## Documentation Index > Fetch the complete documentation index at: https://docs.gtm-api.com/llms.txt > Use this file to discover all available pages before exploring further. # Send Recruiter InMail > Send one LinkedIn Recruiter InMail (outward action): open a NEW recruiter thread via talent_id (AEMAA… id; ln_id / sn_id work too), or reply INTO an existing thread via linkedin_conversation_sid (messenger_type='recruiter'). subject required (≤ 200), text ≤ 1900; rich-text attributes on a NEW thread only. Guards, in order: Recruiter seat (422 recruiter_required); live Recruiter session (409 recruiter_reauth_required: Recruiter has its own 30-day session that only the seat holder renews by signing in to Recruiter again in the account's browser, so tell the user, do not retry); stamped seat on a reply (422 recruiter_seat_unresolvable); LinkedIn's one-InMail-per-candidate-per-24h rule (429 recruiter_inmail_cooldown with cooldown_ends_at: refresh the thread with get_my_latest_linkedin_recruiter_messages if a reply may have landed, else wait and explain the rule). Spends send_inmails and an InMail credit. When NOT: basic threads → send_linkedin_message; SN → send_linkedin_sales_nav_message. Contract: - MCP tool `send_linkedin_recruiter_message`, registry package `mcp.linkedin/linkedin_messages`, mount `linkedin.recruiter`. - Operation `action`, response envelope `action`. - Flags: dangerous: the MCP layer gates it behind a preview/commit token, and the effect cannot be undone through this API. ## OpenAPI ````yaml /api-reference/linkedin/openapi.yaml post /api/linkedin-messages/send-recruiter openapi: 3.0.3 info: title: 'GTM API public contract: gtm.service.linkedin' description: >- Connected LinkedIn accounts and everything driven through them: account health and smart limits, conversations and messages, the connection graph, outbound posting, scraping, profile and company enrichment, and the antidetect browsers that execute it all. GENERATED. This document is projected from the Zod MCP tool registry in `product/mcp/gtm.mcp` (one tool per public endpoint, 1:1). Do not edit it by hand; edit the tool definition and regenerate with `pnpm openapi:public`. Surface: the public `/api` contract of `gtm.service.linkedin`, 179 operations. This is the only OpenAPI document the platform publishes. Internal (`/internal`) and health endpoints are deliberately absent: they are not part of any contract, they can change without notice, and the service source is their only description. Conventions: - Auth is a bearer JWT, optionally narrowed by the `Team-SID` header. - Every success body is an MCP envelope: `success: true` plus one typed `operation` shape (`search`, `get`, `create`, `update`, `delete`, `metrics`, `group_by`, `action`), and a `meta` block with `trace_id` for support. - Every failure is the same `McpError` envelope with a code from a fixed 16-code taxonomy, so a client maps errors once. - Lists page with `page_size` (0 to 500, default 50) plus an opaque forward `cursor`; `page_size: 0` returns counts only. - On `GET` and `DELETE`, object-valued query parameters (`filter`, `sort`) travel as JSON text and array-valued ones repeat as `name[]=value`. - The MCP-only `_meta` field (usage analytics) never reaches the backend and is not part of this contract. version: '1.0' contact: name: GTM API url: https://gtm-api.com email: support@gtm-api.com license: name: Proprietary url: https://gtm-api.com/license servers: - url: https://app.gtm-api.com/linkedin/v4 description: Production, through the app.gtm-api.com gateway security: - BearerJwt: [] TeamSid: [] tags: - name: antidetect_browser_logs description: >- Registry package `mcp.linkedin/antidetect_browser_logs`, served on MCP mount `linkedin.browsers`. - name: antidetect_browser_proxies description: >- Registry package `mcp.linkedin/antidetect_browser_proxies`, served on MCP mount `linkedin.browsers`. - name: antidetect_browsers description: >- Registry package `mcp.linkedin/antidetect_browsers`, served on MCP mount `linkedin.browsers`. - name: cloud_browser_sessions description: >- Registry package `mcp.linkedin/cloud_browser_sessions`, served on MCP mount `linkedin.browsers`. - name: cloud_browsers description: >- Registry package `mcp.linkedin/cloud_browsers`, served on MCP mount `linkedin.browsers`. - name: data_requests description: >- Registry package `mcp.linkedin/data_requests`, served on MCP mount `linkedin.data`. - name: linkedin_account_activity_log description: >- Registry package `mcp.linkedin/linkedin_account_activity_log`, served on MCP mount `linkedin.account-monitor`. - name: linkedin_account_block_log description: >- Registry package `mcp.linkedin/linkedin_account_block_log`, served on MCP mount `linkedin.account-monitor`. - name: linkedin_account_quota_hits description: >- Registry package `mcp.linkedin/linkedin_account_quota_hits`, served on MCP mount `linkedin.account-monitor`. - name: linkedin_account_smart_limits description: >- Registry package `mcp.linkedin/linkedin_account_smart_limits`, served on MCP mount `linkedin.accounts`. - name: linkedin_account_snapshots description: >- Registry package `mcp.linkedin/linkedin_account_snapshots`, served on MCP mount `linkedin.account-monitor`. - name: linkedin_account_sync_runs description: >- Registry package `mcp.linkedin/linkedin_account_sync_runs`, served on MCP mount `linkedin.account-monitor`. - name: linkedin_accounts description: >- Registry package `mcp.linkedin/linkedin_accounts`, served on MCP mount `linkedin.accounts`. - name: linkedin_auto_scrape_results description: >- Registry package `mcp.linkedin/linkedin_auto_scrape_results`, served on MCP mount `linkedin.auto-scrapes`. - name: linkedin_auto_scrape_runs description: >- Registry package `mcp.linkedin/linkedin_auto_scrape_runs`, served on MCP mount `linkedin.auto-scrapes`. - name: linkedin_auto_scrapes description: >- Registry package `mcp.linkedin/linkedin_auto_scrapes`, served on MCP mount `linkedin.auto-scrapes`. - name: linkedin_benchmarks description: >- Registry package `mcp.linkedin/linkedin_benchmarks`, served on MCP mount `linkedin.account-monitor`. - name: linkedin_connection_invitations description: >- Registry package `mcp.linkedin/linkedin_connection_invitations`, served on MCP mount `linkedin.network`. - name: linkedin_connection_requests description: >- Registry package `mcp.linkedin/linkedin_connection_requests`, served on MCP mount `linkedin.network`. - name: linkedin_connections description: >- Registry package `mcp.linkedin/linkedin_connections`, served on MCP mount `linkedin.network`. - name: linkedin_conversations description: >- Registry package `mcp.linkedin/linkedin_conversations`, served on MCP mount `linkedin.messaging`. - name: linkedin_custom_requests description: >- Registry package `mcp.linkedin/linkedin_custom_requests`, served on MCP mount `linkedin.platform`. - name: linkedin_enrichment description: >- Registry package `mcp.linkedin/linkedin_enrichment`, served on MCP mount `linkedin.enrichment`. - name: linkedin_followers description: >- Registry package `mcp.linkedin/linkedin_followers`, served on MCP mount `linkedin.network`. - name: linkedin_messages description: >- Registry package `mcp.linkedin/linkedin_messages`, served on MCP mount `linkedin.messaging`. - name: linkedin_posting description: >- Registry package `mcp.linkedin/linkedin_posting`, served on MCP mount `linkedin.content`. - name: linkedin_scraping description: >- Registry package `mcp.linkedin/linkedin_scraping`, served on MCP mount `linkedin.scraping`. paths: /api/linkedin-messages/send-recruiter: post: tags: - linkedin_messages summary: Send Recruiter InMail description: >- Send one LinkedIn Recruiter InMail (outward action): open a NEW recruiter thread via talent_id (AEMAA… id; ln_id / sn_id work too), or reply INTO an existing thread via linkedin_conversation_sid (messenger_type='recruiter'). subject required (≤ 200), text ≤ 1900; rich-text attributes on a NEW thread only. Guards, in order: Recruiter seat (422 recruiter_required); live Recruiter session (409 recruiter_reauth_required: Recruiter has its own 30-day session that only the seat holder renews by signing in to Recruiter again in the account's browser, so tell the user, do not retry); stamped seat on a reply (422 recruiter_seat_unresolvable); LinkedIn's one-InMail-per-candidate-per-24h rule (429 recruiter_inmail_cooldown with cooldown_ends_at: refresh the thread with get_my_latest_linkedin_recruiter_messages if a reply may have landed, else wait and explain the rule). Spends send_inmails and an InMail credit. When NOT: basic threads → send_linkedin_message; SN → send_linkedin_sales_nav_message. Contract: - MCP tool `send_linkedin_recruiter_message`, registry package `mcp.linkedin/linkedin_messages`, mount `linkedin.recruiter`. - Operation `action`, response envelope `action`. - Flags: dangerous: the MCP layer gates it behind a preview/commit token, and the effect cannot be undone through this API. operationId: send_linkedin_recruiter_message requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/SendLinkedinRecruiterMessageRequest' responses: '200': description: '`action` success envelope.' content: application/json: schema: $ref: '#/components/schemas/SendLinkedinRecruiterMessageResponse' 4XX: $ref: '#/components/responses/McpClientError' 5XX: $ref: '#/components/responses/McpServerError' components: schemas: SendLinkedinRecruiterMessageRequest: type: object description: Request body of `send_linkedin_recruiter_message`. properties: linkedin_account_sid: type: string minLength: 18 maxLength: 18 pattern: ^ln_ac_ description: LinkedIn account sid (ln_ac_…). linkedin_conversation_sid: type: string nullable: true minLength: 18 maxLength: 18 pattern: ^ln_cv_ description: >- Existing recruiter thread (messenger_type='recruiter'); provide this OR a recipient. A reply dispatches with the thread's own counterpart as the recipient. talent_id: type: string nullable: true maxLength: 64 description: >- The recipient's Recruiter (talent) profile id (AEMAA…), from a recruiter thread's talent_id or participants[].talent_id. New-thread mode. ln_id: type: string nullable: true maxLength: 128 description: >- A regular-profile URN (ACoAA…) for a new thread; the wire resolves it too. sn_id: type: string nullable: true maxLength: 64 description: >- A Sales Navigator URN (ACwAA…) for a new thread; the wire resolves it too. subject: type: string minLength: 1 maxLength: 200 description: InMail subject; 1..200 chars, required on both wires. text: type: string minLength: 1 maxLength: 1900 description: InMail body; 1..1900 chars, \n line breaks. attributes: type: array items: type: object properties: start: type: integer minimum: 0 description: Offset into text in UTF-16 code units (JS String offsets). length: type: integer minimum: 1 description: >- Run length in UTF-16 code units; start + length must fit inside text. kind: type: object additionalProperties: {} description: >- The formatting, an object with exactly one key: {"bold":{}}, {"italic":{}}, {"listItem":{}}, {"list":{"ordered":false}}, {"hyperlink":{"url":"https://..."}}. required: - start - length - kind maxItems: 200 description: >- Rich-text runs over text. NEW THREAD ONLY: a reply with attributes is refused 422 attributes_not_supported_in_thread. required: - linkedin_account_sid - subject - text SendLinkedinRecruiterMessageResponse: type: object properties: success: type: boolean enum: - true operation: type: string enum: - action action: type: string description: kebab-case verb; matches the route segment. item: type: object nullable: true properties: sid: type: string team_sid: type: string linkedin_account_sid: type: string linkedin_conversation_sid: type: string messenger_type: type: string enum: - linkedin - sales_navigator - recruiter description: >- Messenger surface: the basic LinkedIn messenger, Sales Navigator, or the LinkedIn Recruiter inbox. linkedin_type: type: string enum: - message - inmail - connection_note description: >- Channel sub-kind: regular DM / premium InMail / system-seeded connection note. type: type: string enum: - inbox - outbox description: 'Direction relative to our account: received / sent.' automation: type: string enum: - auto - manual - connect - synced description: Writer provenance. ln_member_id: type: string ln_id: type: string nullable: true sn_id: type: string nullable: true talent_id: type: string nullable: true description: >- The counterpart's LinkedIn Recruiter (talent) profile id, denormalized from the parent recruiter thread. Null off the recruiter surface. nickname: type: string nullable: true subject: type: string nullable: true text: type: string client_reference: type: string nullable: true attachments: type: array items: type: object properties: id: type: string urn: type: string description: >- digitalmediaAsset URN; the attachment_urn the download tools take. name: type: string content_type: type: string content_url: type: string file_byte_size: type: number path: type: string description: 'Outbound rows only: the https:// URL we uploaded from.' size: type: number description: Outbound rows only. reactions: type: array nullable: true items: type: object properties: emoji: type: string count: type: number is_viewer_reacted: type: boolean first_reacted_at: type: string nullable: true required: - emoji - count - is_viewer_reacted - first_reacted_at is_deleted: type: boolean message_hash: type: string sent_at: type: string custom_content: type: object nullable: true additionalProperties: {} created_at: type: string updated_at: type: string deleted_at: type: string nullable: true required: - sid - team_sid - linkedin_account_sid - linkedin_conversation_sid - messenger_type - linkedin_type - type - automation - ln_member_id - ln_id - sn_id - talent_id - nickname - subject - text - client_reference - attachments - reactions - is_deleted - message_hash - sent_at - custom_content - created_at - updated_at - deleted_at result: type: object additionalProperties: {} meta: type: object properties: trace_id: type: string description: UUID v7; same 128-bit value as the X-Trace-Id header. span_id: type: string pattern: ^[0-9a-f]{16}$ description: 16 hex chars, root span of this request. timestamp: type: string description: ISO 8601 UTC (Y-m-dTH:i:sZ), response time. duration_ms: type: integer minimum: 0 description: Server-side wall clock. team_sid: type: string nullable: true description: >- The team this call ran in (the token team, or the team_sid override). Null when unauthenticated; absent from pre-2026-08-20 backends. actor_type: type: string nullable: true description: >- user | agent | api_key | system. Null when unauthenticated; absent from pre-2026-08-20 backends. required: - trace_id - span_id - timestamp - duration_ms required: - success - operation - action - item - result - meta McpError: type: object properties: success: type: boolean enum: - false error: type: object properties: code: type: string enum: - validation_failed - nothing_to_update - not_found - relation_not_found - invalid_transition - limit_exceeded - payment_required - duplicate_rejected - conflict - delete_blocked - unauthorized - forbidden - rate_limited - internal_error - service_unavailable - not_implemented message: type: string recoverable: type: boolean suggestion: type: string field_errors: type: object additionalProperties: type: array items: type: object properties: rule: type: string message: type: string required: - rule - message blockers: type: array items: type: object properties: type: type: string description: >- Machine-readable blocker type (active_flow, pending_tasks, …). severity: type: string enum: - hard - soft description: >- hard = external action required; soft = acknowledge is enough. description: type: string entity_sid: type: string nullable: true count: type: integer resolution: type: string description: 'Hard: tool name to call. Soft: code for acknowledge[].' resolution_hint: type: string required: - type - severity - description - entity_sid - resolution - resolution_hint context: type: object additionalProperties: {} required: - code - message - recoverable meta: type: object properties: trace_id: type: string description: UUID v7; same 128-bit value as the X-Trace-Id header. span_id: type: string pattern: ^[0-9a-f]{16}$ description: 16 hex chars, root span of this request. timestamp: type: string description: ISO 8601 UTC (Y-m-dTH:i:sZ), response time. duration_ms: type: integer minimum: 0 description: Server-side wall clock. team_sid: type: string nullable: true description: >- The team this call ran in (the token team, or the team_sid override). Null when unauthenticated; absent from pre-2026-08-20 backends. actor_type: type: string nullable: true description: >- user | agent | api_key | system. Null when unauthenticated; absent from pre-2026-08-20 backends. required: - trace_id - span_id - timestamp - duration_ms required: - success - error responses: McpClientError: description: >- MCP error envelope. `error.code` is one of validation_failed, nothing_to_update, not_found, relation_not_found, invalid_transition, limit_exceeded, payment_required, duplicate_rejected, conflict, delete_blocked, unauthorized, forbidden, rate_limited, not_implemented. content: application/json: schema: $ref: '#/components/schemas/McpError' McpServerError: description: >- MCP error envelope with `error.code` internal_error or service_unavailable. content: application/json: schema: $ref: '#/components/schemas/McpError' securitySchemes: BearerJwt: type: http scheme: bearer bearerFormat: JWT description: >- Access token issued by gtm.service.id. Its `access_identity` claim carries `team_sid`, `actor_sid` and `actor_type`, and that team scope is authoritative. TeamSid: type: apiKey in: header name: Team-SID description: >- Team scope for tokens that do not carry one. Ignored when the token already names a team. ````