> ## Documentation Index > Fetch the complete documentation index at: https://docs.trylath.com/llms.txt > Use this file to discover all available pages before exploring further. > ## Agent Instructions > Every Lath operation is POST https://platform.trylath.com/, with a JSON body and `Authorization: Bearer `. `email.send` is POST /email/send. > Branch on `error.code`, never on `error.message`. Every refusal also carries `error.fix`, which names the next step. > Send an `Idempotency-Key` header on any operation that is not retry-safe, so a retry cannot run it twice. > A `lath_test_` key emails only the account's own members and sends no SMS; a `lath_live_` key reaches real recipients and is billed. > The OpenAPI document, generated from the same registry as the routes, is at https://platform.trylath.com/openapi.json. # developers.activity.get > Opens one activity row: who acted and through which surface, whether it worked and — when refused — the error code, message and fix the caller received, how long it took, the input with secrets and message bodies redacted, the ids of what it created or changed, and the events it raised. ## OpenAPI ````yaml /api-reference/openapi.json post /developers/activity/get openapi: 3.1.0 info: title: Lath API version: 0.1.0 description: >- Every operation is one POST. The same set is reachable over MCP, the SDK and the CLI; nothing is dashboard-only. servers: - url: https://platform.trylath.com description: This deployment security: [] paths: /developers/activity/get: post: tags: - developers summary: developers.activity.get description: >- Opens one activity row: who acted and through which surface, whether it worked and — when refused — the error code, message and fix the caller received, how long it took, the input with secrets and message bodies redacted, the ids of what it created or changed, and the events it raised. operationId: developers.activity.get parameters: [] requestBody: required: true content: application/json: schema: $schema: https://json-schema.org/draft/2020-12/schema type: object properties: id: type: string format: uuid pattern: >- ^([0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[1-8][0-9a-fA-F]{3}-[89abAB][0-9a-fA-F]{3}-[0-9a-fA-F]{12}|00000000-0000-0000-0000-000000000000|ffffffff-ffff-ffff-ffff-ffffffffffff)$ description: >- An activity id, from developers.activity.list or the activityId any mutation returns required: - id additionalProperties: false responses: '200': description: '{ activityId, result }. activityId is empty for reads.' content: application/json: schema: type: object properties: activityId: type: string description: The activity this call created, or empty for a read. result: $schema: https://json-schema.org/draft/2020-12/schema type: object properties: activity: type: object properties: id: type: string format: uuid pattern: >- ^([0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[1-8][0-9a-fA-F]{3}-[89abAB][0-9a-fA-F]{3}-[0-9a-fA-F]{12}|00000000-0000-0000-0000-000000000000|ffffffff-ffff-ffff-ffff-ffffffffffff)$ actorType: type: string actorId: type: string actorLabel: type: - string - 'null' operation: type: string createdAt: type: string format: date-time pattern: >- ^(?:(?:\d\d[2468][048]|\d\d[13579][26]|\d\d0[48]|[02468][048]00|[13579][26]00)-02-29|\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\d|30)|(?:02)-(?:0[1-9]|1\d|2[0-8])))T(?:(?:[01]\d|2[0-3]):[0-5]\d:[0-5]\d(?:\.\d+)?(?:Z|([+-](?:[01]\d|2[0-3]):[0-5]\d)))$ result: type: string enum: - ok - refused description: >- ok: the operation completed; refused: it was turned down and changed nothing errorCode: description: The error code the caller received, when refused type: - string - 'null' source: anyOf: - type: string enum: - dashboard - api - cli - mcp - system - type: 'null' description: >- Which surface carried the call; null for activity recorded before sources were kept durationMs: anyOf: - type: integer minimum: -9007199254740991 maximum: 9007199254740991 - type: 'null' errorMessage: type: - string - 'null' errorFix: type: - string - 'null' input: description: >- The input as recorded: secret-shaped fields and message bodies replaced with "[redacted]", long values cut. Null for activity recorded before inputs were kept. resourceIds: anyOf: - type: object propertyNames: type: string additionalProperties: type: string - type: 'null' description: >- The ids the operation returned, keyed by the field they came back under events: type: array items: type: object properties: id: type: string format: uuid pattern: >- ^([0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[1-8][0-9a-fA-F]{3}-[89abAB][0-9a-fA-F]{3}-[0-9a-fA-F]{12}|00000000-0000-0000-0000-000000000000|ffffffff-ffff-ffff-ffff-ffffffffffff)$ type: type: string payload: type: object propertyNames: type: string additionalProperties: {} createdAt: type: string format: date-time pattern: >- ^(?:(?:\d\d[2468][048]|\d\d[13579][26]|\d\d0[48]|[02468][048]00|[13579][26]00)-02-29|\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\d|30)|(?:02)-(?:0[1-9]|1\d|2[0-8])))T(?:(?:[01]\d|2[0-3]):[0-5]\d:[0-5]\d(?:\.\d+)?(?:Z|([+-](?:[01]\d|2[0-3]):[0-5]\d)))$ required: - id - type - payload - createdAt additionalProperties: {} required: - id - actorType - actorId - actorLabel - operation - createdAt - result - errorCode - source - durationMs - errorMessage - errorFix - input - resourceIds - events additionalProperties: {} required: - activity additionalProperties: {} required: - activityId - result '400': description: invalid_input or invalid_json '401': description: unauthenticated '403': description: forbidden '404': description: not_found '409': description: 'conflict: idempotency_mismatch, email_taken, last_key' '413': description: body_too_large '429': description: rate_limited security: - bearer: [] components: securitySchemes: bearer: type: http scheme: bearer description: >- A Lath API key: lath_live_… or lath_test_… on a server, lath_live_pk… or lath_test_pk… in a browser. ````