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feat(spawn): pass Codex startup prompts as developer instructions #914

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Merged
laynepenney merged 1 commit into from
Aug 25, 2026
Merged

feat(spawn): pass Codex startup prompts as developer instructions #914

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2 changes: 1 addition & 1 deletion Cargo.toml
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Original file line number Diff line number Diff line change
Expand Up @@ -99,11 +99,11 @@ urlencoding = "2"
base64 = "0.22"
futures = "0.3"
which = "7"
tempfile = "3"
clap_complete = "4.5.65"
rusqlite = { version = "0.39.0", features = ["bundled"] }

[dev-dependencies]
tempfile = "3"
tokio-test = "0.4"
wiremock = "0.6"
assert_cmd = "2"
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12 changes: 8 additions & 4 deletions docs/gr-spawn.md
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Expand Up @@ -66,7 +66,12 @@ Each agent can have a startup prompt file (Markdown) that defines its role, resp
reviewer.md
```

Prompts are injected via the `--prompt` flag when launching the agent's CLI tool. They should include:
Startup prompt delivery follows the target runtime's native instruction boundary. For
Codex, gitgrip passes the file as `developer_instructions`, keeping identity separate
from the first user turn. Other tools can consume the same file through their configured
launch arguments, such as Claude Code's `--append-system-prompt-file`.

Prompts should include:
- Role description
- Responsibilities
- Startup checklist (join channel, read journal, check unread, start loop)
Expand Down Expand Up @@ -140,7 +145,7 @@ tmux select-window -t myproject:lead
|-------|---------|-------------|
| `session_name` | `"synapt"` | tmux session name |
| `channel` | `"dev"` | Default channel all agents join |
| `auto_journal` | `true` | Agents read `recall_journal` on startup |
| `auto_journal` | `true` | Paste recall startup context into Codex as a compatibility fallback. Disable when a runtime SessionStart hook owns continuity. |
| `mock_launch` | `false` | Use echo/sleep instead of real agent launch |

### [agents.*] section
Expand All @@ -151,7 +156,7 @@ tmux select-window -t myproject:lead
| `model` | no | `claude-sonnet-4-6` | Model ID |
| `tool` | no | `claude` | CLI tool (`claude`, `codex`, `cursor`) |
| `worktree` | no | `main` | Git worktree or `"new"` to auto-create |
| `startup_prompt` | no | — | Path to .md startup prompt file |
| `startup_prompt` | no | — | Path to an agent identity prompt. Codex receives it as developer instructions. |
| `channel` | no | from `[spawn]` | Channel to auto-join |
| `loop_interval` | no | `5m` | Channel read loop cadence |
| `heartbeat_interval` | no | `60` | Seconds between heartbeat pings |
Expand All @@ -174,4 +179,3 @@ tmux select-window -t myproject:lead
| `SYNAPT_LOOP_INTERVAL` | `loop_interval` field | `2m` |

Plus any custom vars from the `env` table in `agents.toml`.

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