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

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

TODO.md

@@ -21,12 +21,12 @@ the owner's OS user and can never be granted. Indirection there really is accide
 
 ## Themes
 
-**96 open, 30 closed**, across 32 themes.
+**97 open, 30 closed**, across 32 themes.
 
 | Theme                                                                                      | Open | Closed |
 | ------------------------------------------------------------------------------------------ | ---- | ------ |
 | [Affordances](todo/affordances/)                                                           | 2    | 0      |
-| [Agents coordinating agents](todo/agent-coordination/)                                     | 2    | 0      |
+| [Agents coordinating agents](todo/agent-coordination/)                                     | 3    | 0      |
 | [Speaking into a session from the backend](todo/agent-delivery/)                           | 1    | 1      |
 | [Backburner](todo/backburner/)                                                             | 3    | 0      |
 | [Background jobs](todo/background-jobs/)                                                   | 2    | 1      |
@@ -68,6 +68,7 @@ the owner's OS user and can never be granted. Indirection there really is accide
 ## Newest ten
 
 - `2026-08-25` **An affordance: a scoped agent warns when a request lands outside its scope** — [affordances/an-affordance-a-scoped-agent-warns-on-the](todo/affordances/an-affordance-a-scoped-agent-warns-on-the.md)
+- `2026-08-25` **Commit signing is inconsistent across harnesses — Claude names itself, opencode names nothing** — [agent-coordination/commit-signing-is-inconsistent-across-harnesses](todo/agent-coordination/commit-signing-is-inconsistent-across-harnesses.md)
 - `2026-08-25` **Resurrect Projects/Apps** — [backburner/resurrect-projects-apps](todo/backburner/resurrect-projects-apps.md)
 - `2026-08-25` **Refresh mid-turn folds the live tool call — it reads as finished while still running** — [known-bugs/refresh-mid-tool-call-renders-the-turn-folded](todo/known-bugs/refresh-mid-tool-call-renders-the-turn-folded.md)
 - `2026-08-25` **The model picker shows `claude-code` instead of the model that is running** — [known-bugs/the-model-picker-shows-the-bare-harness](todo/known-bugs/the-model-picker-shows-the-bare-harness.md)
@@ -76,4 +77,3 @@ the owner's OS user and can never be granted. Indirection there really is accide
 - `2026-08-25` **Add a favorites tab/panel to the file browser** — [multi-user/add-a-favorites-tab-panel-to-the-file-browser](todo/multi-user/add-a-favorites-tab-panel-to-the-file-browser.md)
 - `2026-08-23` **A worker cannot verify that the owner delegated to a manager, so it has to ask every time** — [agent-coordination/a-peer-cannot-verify-a-delegation](todo/agent-coordination/a-peer-cannot-verify-a-delegation.md)
 - `2026-08-23` **An agent cannot learn its own transcript id, so it cannot sign its own work** — [agent-coordination/an-agent-cannot-learn-its-own-session-id](todo/agent-coordination/an-agent-cannot-learn-its-own-session-id.md)
-- `2026-08-23` **The SendOff file size limit is one constant for everybody** — [sendoff/per-user-size-limit](todo/sendoff/per-user-size-limit.md)

todo/agent-coordination/commit-signing-is-inconsistent-across-harnesses.md

@@ -0,0 +1,38 @@
+---
+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.