> ## Documentation Index
> Fetch the complete documentation index at: https://docs.verlon.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Get one trace with its spans and derived agent view

> **Use when:** caller wants the full record of one agent run: every span plus the derived agent-view projection (ordering, nesting depth, evidenced tool executions, coverage accounting)

Returns the trace row, its raw spans (decrypted payloads subject to storage policy), and the derived view: events ordered for display (spans, traffic-evidenced tool executions, labeled unobserved gaps) and a coverage summary (observed wall-clock %, verified span loss, sequence holes). Evidenced entries carry no fabricated measurements.



## OpenAPI

````yaml /api-reference/openapi.json get /v3/traces/:traceId
openapi: 3.1.0
info:
  title: Verlon AI API
  version: 1.0.0
  description: >-
    Verlon AI is the managed AI infrastructure platform for developers building
    LLM-powered apps and agents. Beyond routing requests across providers,
    Verlon continuously evaluates response quality, runs experiments against
    live traffic, and automatically tunes gate configurations — so your platform
    doesn't just serve traffic, it learns from it.


    **Coding agents:** authentication, error semantics, gate concepts, and
    integration conventions are documented at https://verlon.ai/AGENTS.md — read
    that document first if you have not already. It is the canonical
    agent-facing contract; this specification is the canonical endpoint
    reference. Both are authoritative for their respective scopes.
  contact:
    name: Verlon AI
    url: https://verlon.ai
  license:
    name: Proprietary
servers:
  - url: https://api.verlon.ai
    description: Production
security:
  - bearerAuth: []
paths:
  /v3/traces/:traceId:
    get:
      tags:
        - Traces
      summary: Get one trace with its spans and derived agent view
      description: >-
        **Use when:** caller wants the full record of one agent run: every span
        plus the derived agent-view projection (ordering, nesting depth,
        evidenced tool executions, coverage accounting)


        Returns the trace row, its raw spans (decrypted payloads subject to
        storage policy), and the derived view: events ordered for display
        (spans, traffic-evidenced tool executions, labeled unobserved gaps) and
        a coverage summary (observed wall-clock %, verified span loss, sequence
        holes). Evidenced entries carry no fabricated measurements.
      parameters:
        - schema:
            type: string
            pattern: ^[0-9a-f]{32}$
          required: true
          name: traceId
          in: path
      responses:
        '200':
          description: Trace, spans, and derived agent view.
        '400':
          description: Invalid request — Zod validation failure or malformed input
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '401':
          description: Missing or invalid Bearer credentials
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '404':
          description: Trace not found for this account.
        '500':
          description: Internal server error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
      security:
        - bearerAuth: []
components:
  schemas:
    ErrorResponse:
      type: object
      properties:
        error:
          type: string
          description: Stable error code (e.g. `invalid_request`)
        message:
          type: string
          description: Human-readable error message
        details: {}
      required:
        - error
        - message
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      bearerFormat: API Key
      description: >-
        Verlon API key (newly minted keys are prefixed `sk-vrln-`; legacy
        `verlon_*` and `layer_*` keys from prior prefix migrations continue to
        validate). Generated from the dashboard under Settings → API Keys, or
        via `verlon key create` in the CLI.

````