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GeezerVison is showing github.com — feat: add idempotent start tokens to the workspace agent process API by ibetitsmike · Pull Request #27322 · coder/coder

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@ibetitsmike

@ibetitsmike ibetitsmike commented Jul 17, 2026 •
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Adds idempotent start tokens to the workspace agent process API: a client-supplied opaque token makes process starts exactly-once per token and addressable by token.

Part 6/9 of the CODAGT-757 execution ledger stack (base: #5). Agent and SDK surface only; chatd adopts it in the next two PRs. Supersedes the agent portion of #27102.

Changes

  • StartProcessRequest.ClientToken: the manager reserves the token before spawning, echoes it on the response, and returns the existing process (env-matched) for a duplicate token instead of starting a second process. Concurrent same-token starts collapse to one spawn; waiters honor cancellation and unblock on close.
  • GET /api/v0/processes/tokens/{token}: token probe returning the process (or pending reservation) owning a token.
  • Token index lifecycle: reaped with exited processes on the 60-minute horizon; tokenIndexAge exposes staleness so callers can decide whether an absent token is trustworthy.
  • workspacesdk: ProcessByToken on AgentConn, ProbeProcessToken helper, mock support.

This PR was authored by Mux, an AI coding agent, on Mike's behalf. The stack recomposes the previously reviewed #27100/#27102/#27103 into reviewable pieces, plus fixes from subsequent review rounds.

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@github-actions github-actions Bot assigned ibetitsmike Jul 17, 2026
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feat(coderd): track chat execute tool calls in a durable execution ledger #27100
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feat: add idempotent start tokens to the workspace agent process API #27102
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fix(coderd/x/chatd): keep task attempts alive while execute tools make progress #27103
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Codex Review: Didn't find any major issues. 👍

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feat: add idempotent start tokens to the workspace agent process API
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Superseded by a simplified, ledger-free cut of CODAGT-757: #27369, #27370, #27371, #27372.

The new stack drops the database execution ledger entirely and instead relies on agent-side idempotent start tokens with at-least-once semantics: replays attach to the original process when the agent still knows the token, and re-run otherwise. The branches of this stack are kept as the salvage reference until the new stack merges.

This comment was written by Mux, an AI coding agent, operating on Mike's behalf.
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@ibetitsmike ibetitsmike closed this Jul 21, 2026
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