---
title: "POST /projects/{projectId}/traces/compare"
method: POST
path: "/projects/{projectId}/traces/compare"
---

# POST /projects/{projectId}/traces/compare

`POST /projects/{projectId}/traces/compare`

## Request

- Base URL: `https://api.caveman.so/api/v1`
- URL: `https://api.caveman.so/api/v1/projects/{projectId}/traces/compare`
- Auth: one of:
  - OAuth 2
    - Authorization code: `/api/v1/oauth/authorize`
    - Token URL: `/api/v1/oauth/token` scopes: `trace:read_metadata`
  - HTTP bearer
  - API key in cookie `cave_access`
  - API key in cookie `__Secure-cave_identity.session_token`

POST /api/v1/projects/{projectId}/traces/compare on the Caveman Cloud control plane. Requires the trace:read_metadata scope. Exposed to autonomous agents as the compare action of the caveman_traces tool (read access). Search and inspect LLM requests and whole tasks as metadata, span trees and steps, with the judgments on any of them. Captured content needs the connection's explicit payload grant. Scores carry each trace's latest Judgment per criterion, and search filters by a criterion's verdict.

## Request body

- object
  - `baseline` object, required
    - `from` string, date-time, required: Earliest UTC start; current.to must be at most 90 days later.
    - `to` string, date-time, required
  - `current` object, required
    - `from` string, date-time, required
    - `to` string, date-time, required: UTC end, after current.from and at most 90 days after baseline.from.
  - `filters` object
    - `agent` string[]
    - `workflow` string[]
    - `model` string[]
    - `provider` string[]
    - `session_id` string[]
    - `trace_id` string[]

## Response `2XX`

Successful response. Exact status depends on synchronous or durable delivery outcome.

## Other responses

- `4XX`: Structured failure. `error.code` is stable; `error.request_id` is echoed in the x-cave-request-id header.
- `5XX`: Structured failure. `error.code` is stable; `error.request_id` is echoed in the x-cave-request-id header.

---

[API](https://skmtc.dev/caveman/apis/caveman-cloud-api.md) - [All operations](https://skmtc.dev/caveman/apis/caveman-cloud-api/llms.txt) - [OpenAPI document](https://skmtc.dev/caveman/apis/caveman-cloud-api/revisions/508312d01cfc?raw)