> ## 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. # Check whether a LinkedIn message went out > Ask what a LinkedIn message send came to, without sending: by the client_reference it went out under (optionally at one place: linkedin_conversation_sid, ln_member_id or profile_urn), or by the activity_log_sid a 409 named. result.outcome: sent (item is the message, or null with reason message_row_pending or caller_confirmed), in_flight, unknown (the thread has not shown it yet; retry_after, send_decisive_at), or not_sent (no_send_under_key, refused, not_in_thread, caller_confirmed). Send the same request again only on not_sent, under the same key. result.activity_log_sid is the attempt a person's word names (confirmed_not_sent / confirmed_sent on the send tools). A send in doubt has its thread read now when a look is due, so a call can be slow. A key sent to several places is 422 place_required, a place in another form than the sends recorded 422 place_unmatched (context.places). Invitations: check_linkedin_connection_request_sent; comments, posts, reposts: check_linkedin_posting_sent. Contract: - MCP tool `check_linkedin_message_sent`, registry package `mcp.linkedin/linkedin_messages`, mount `linkedin.messaging`. - Operation `action`, response envelope `action`. - Flags: none. ## OpenAPI ````yaml /api-reference/linkedin/openapi.yaml post /api/linkedin-messages/check-sent 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`, 189 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/check-sent: post: tags: - linkedin_messages summary: Check whether a LinkedIn message went out description: >- Ask what a LinkedIn message send came to, without sending: by the client_reference it went out under (optionally at one place: linkedin_conversation_sid, ln_member_id or profile_urn), or by the activity_log_sid a 409 named. result.outcome: sent (item is the message, or null with reason message_row_pending or caller_confirmed), in_flight, unknown (the thread has not shown it yet; retry_after, send_decisive_at), or not_sent (no_send_under_key, refused, not_in_thread, caller_confirmed). Send the same request again only on not_sent, under the same key. result.activity_log_sid is the attempt a person's word names (confirmed_not_sent / confirmed_sent on the send tools). A send in doubt has its thread read now when a look is due, so a call can be slow. A key sent to several places is 422 place_required, a place in another form than the sends recorded 422 place_unmatched (context.places). Invitations: check_linkedin_connection_request_sent; comments, posts, reposts: check_linkedin_posting_sent. Contract: - MCP tool `check_linkedin_message_sent`, registry package `mcp.linkedin/linkedin_messages`, mount `linkedin.messaging`. - Operation `action`, response envelope `action`. - Flags: none. operationId: check_linkedin_message_sent requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/CheckLinkedinMessageSentRequest' responses: '200': description: '`action` success envelope.' content: application/json: schema: $ref: '#/components/schemas/CheckLinkedinMessageSentResponse' 4XX: $ref: '#/components/responses/McpClientError' 5XX: $ref: '#/components/responses/McpServerError' components: schemas: CheckLinkedinMessageSentRequest: type: object description: Request body of `check_linkedin_message_sent`. properties: linkedin_account_sid: type: string minLength: 18 maxLength: 18 pattern: ^ln_ac_ description: >- The account that sent (ln_ac_…). A key is looked up on this account only. client_reference: type: string nullable: true minLength: 1 maxLength: 255 description: >- The key the send went out under, byte for byte. Exactly one of client_reference / activity_log_sid. Found at any age: a send in doubt never ages out of its key. activity_log_sid: type: string nullable: true minLength: 18 maxLength: 18 pattern: ^ln_al_ description: >- The attempt a 409 or an earlier check named (ln_al_…); it takes no place. An attempt of another account is 404. linkedin_conversation_sid: type: string nullable: true minLength: 18 maxLength: 18 pattern: ^ln_cv_ description: >- Place, next to client_reference: the thread the send named or landed in. One place at most; a thread of another account is 404. ln_member_id: type: string nullable: true maxLength: 64 description: 'Place, next to client_reference: the person''s member id (digits).' profile_urn: type: string nullable: true maxLength: 128 description: >- Place, next to client_reference: the recipient id the send was given (ln_id ACoAA…, sn_id ACwAA…, or a Recruiter id). required: - linkedin_account_sid CheckLinkedinMessageSentResponse: 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 - system description: >- Channel sub-kind: regular DM / premium InMail / system-seeded connection note / a notice LinkedIn posted into the thread on someone's action (system: a rename, a member added or removed, a member leaving; the body is LinkedIn's own sentence, the sender the acting member; not a message: it takes no reaction and no recall, draw it as history). type: type: string enum: - inbox - outbox description: 'Direction relative to our account: received / sent.' automation: type: string enum: - auto - manual - synced description: >- Writer provenance: a sequence runner (auto), a person through a send tool (manual), or the messages sync (synced). An invitation note is a synced row labelled linkedin_type=connection_note; the 'connect' value left on 2026-09-20 with the seeders that were its only writer and never shipped. ln_member_id: type: string nullable: true description: >- The counterpart's member id, decoded from whichever LinkedIn id the thread carries. Null only on a thread with an organization (a Message Ads page names nobody). ln_id: type: string nullable: true sn_id: type: string nullable: true recruiter_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 - recruiter_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 properties: outcome: type: string description: >- sent | not_sent | in_flight | unknown. Send the same request again only on not_sent; on in_flight or unknown ask again after retry_after. reason: type: string nullable: true description: >- Why. sent: null (item is the row), message_row_pending (it went out, its row comes later), caller_confirmed (a person said so; no row). not_sent: no_send_under_key, refused, not_in_thread, caller_confirmed. unknown: answer_lost, may_still_land, thread_unreadable, unexplained_message, unprovable. retry_after: type: string description: >- ISO 8601: for a send in doubt, when its thread is read next or the moment it can no longer land. activity_log_sid: type: string description: >- The attempt the answer is about (in flight, in doubt or landed): what confirmed_not_sent / confirmed_sent name on the send tools. send_decisive_at: type: string description: >- ISO 8601: the moment a send in doubt can no longer land; a person's confirmed_not_sent is taken from then on. required: - outcome - reason 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. ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.