---
title: "Usage breakdown"
method: GET
path: "/projects/{projectId}/user-testing/scenarios/{scenarioId}/usage"
tags: ["User testing"]
---

# Usage breakdown

`GET /projects/{projectId}/user-testing/scenarios/{scenarioId}/usage`

Which models, tools and servers the scenario's sessions used.

**Check `scan.truncated` before quoting a rate.** `404` when there is no usage data yet.

## Response `200`

The breakdown.

- ScenarioUsage — Usage breakdown: models, tools and servers the scenario's sessions actually used. **Read `scan.truncated` before quoting any rate from this.** True means the rates were computed over the most recent N sessions rather than all of them, and dropping the flag turns a conditional statistic into an unconditional claim. Unpinned for the same reason as `ScenarioMetrics`.

## Other responses

- `401` — Missing, invalid, revoked, or orphaned key (`UNAUTHORIZED`) — or the **target MCP server** needs an OAuth grant (`OAUTH_REQUIRED`), which is a property of the server, not your key.
- `403` — Key is valid but not allowed to do this.
- `404` — Unknown project, server, or resource.
- `429` — Per-key rate limit exceeded (60 requests/minute sustained, bursts up to 10). Honor `Retry-After` and back off with jitter.
- `500` — Something failed on MCPJam's side.

---

[API](https://skmtc.net/mcpjam/apis/mcpjam-api.md) · [All operations](https://skmtc.net/mcpjam/apis/mcpjam-api/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/mcpjam/mcpjam-api/revisions/7d1aff84ce3b/schema)