todo: opencode signs no commits at all, claude is missing only the id

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
2026-08-25 09:54:42 +00:00
parent 21bc460892
commit c4cd42eb29
2 changed files with 41 additions and 3 deletions
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+---
+id: agent-coordination/commit-signing-is-inconsistent-across-harnesses
+title: 'Commit signing is inconsistent across harnesses — Claude names itself, opencode names nothing'
+theme: agent-coordination
+status: open
+created: 2026-08-25
+date_source: stated
+order: 3
+---
+
+**Every commit an agent makes should be signed with its harness name AND its chat/session id.** Raised
+2026-08-25, and the owner's own audit of what actually happens today splits the work in two, because
+the two harnesses are missing different halves:
+
+- **Claude Code already does the harness-name half** — every commit in this repo's history carries
+  `Co-Authored-By: Claude <model> <noreply@anthropic.com>`. The id half is **known and already
+  blocked**, not missed: `agent-coordination/an-agent-cannot-learn-its-own-session-id` explains why (no
+  reliable way for a session to learn its own transcript id) and `CLAUDE.md`'s own "An agent's commit
+  names the session that made it" section names the same precondition. Nothing new to file for Claude —
+  this item exists for the other half.
+
+- **opencode signs nothing at all.** Not the harness name, not an id — checked 2026-08-25, no
+  `Co-Authored-By` convention and no session-identifying trailer anywhere in
+  `src/servers/sidecar/opencode/`. This is a DIFFERENT gap from Claude's: naming the harness has no
+  precondition and no blocker. It could be added today, independent of the transcript-id mechanism —
+  opencode simply has no instruction telling it to identify itself in a commit at all.
+
+So there are two pieces of work, not one, and they are not coupled:
+
+1. **opencode: add the harness-name half now.** Whatever hands opencode its system prompt / commit
+   conventions (the equivalent of `CLAUDE.md` for that harness — search
+   `src/servers/sidecar/opencode/` for where its instructions are assembled) needs the same
+   `Co-Authored-By: opencode <...>` line Claude already writes. No dependency on anything unbuilt.
+2. **Both harnesses: add the id half once the precondition lands.** This is exactly
+   `agent-coordination/an-agent-cannot-learn-its-own-session-id` — give every session its own chat id at
+   turn time (the mechanism `commanderBlock` already proves for commanders), then both harnesses' commit
+   trailers gain an `Officer-Session:`-style line. Do this once, generalized, rather than solving it
+   twice per harness.