---
title: "POST /optimization-proposals/{proposalId}/evidence"
method: POST
path: "/optimization-proposals/{proposalId}/evidence"
---

# POST /optimization-proposals/{proposalId}/evidence

`POST /optimization-proposals/{proposalId}/evidence`

## Request

- Base URL: `https://api.caveman.so/api/v1`
- URL: `https://api.caveman.so/api/v1/optimization-proposals/{proposalId}/evidence`
- Auth: one of:
  - OAuth 2
    - Authorization code: `/api/v1/oauth/authorize`
    - Token URL: `/api/v1/oauth/token` scopes: `proposal:draft`
  - HTTP bearer
  - API key in cookie `cave_access`
  - API key in cookie `__Secure-cave_identity.session_token`

POST /api/v1/optimization-proposals/{proposalId}/evidence on the Caveman Cloud control plane. Requires the proposal:draft scope. Not exposed to autonomous agents: The proposal-keyed spelling of the local fix lane's evidence, driven by `caveman agent submit` and gated on proposal:draft, which an MCP agent connection is never granted (only the onboarding wizard's connection holds it). An agent reports the same bundle by brief (briefs.fix_report): an agent grading its own work is exactly why the server labels it self_reported and caps it at candidate.

## 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)