> ## Documentation Index
> Fetch the complete documentation index at: https://smithers-feat-claude-workflow-mirror.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# streamDevTools

> Gateway RPC for DevTools snapshot and delta streams.

* Method: `streamDevTools`
* Scope: `observability:read`
* Transport: WebSocket RPC (streaming only)
* Request: `{ runId, afterSeq?, fromSeq? }`
* Response: `{ streamId, runId, fromSeq, afterSeq }`

Errors are versioned as `v1` and include `InvalidRequest`, `Unauthorized`, `Forbidden`, `RunNotFound`, `SeqOutOfRange`, `BackpressureDisconnect`, and `Internal`.

The legacy `fromSeq` field is accepted; `afterSeq` is the stable v1 name. If both are provided, they must match.