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feat(coding-agent): add configurable title system prompt for sessions

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- add discovery of `TITLE_SYSTEM.md` and pass it through interactive startup context
- route custom title prompts to online and local tiny title generators via protocol
- update session-title docs and changelog with override behavior
- add tests for prompt discovery, forwarding, and fallback to bundled title prompts
This commit is contained in:
Adryel Dearo
2026-06-09 14:13:20 -03:00
committed by can1357
parent 96defff9a5
commit ecbc2a3c15
15 changed files with 232 additions and 19 deletions
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docs/system-prompt-customization.md
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@@ -124,6 +124,18 @@ The dynamic project/environment footer that remains after `SYSTEM.md` is only bl
There is currently no supported CLI mode for "replace the stable default instructions but keep the generated skills/rules/tool guidance." If you need automatic skills loading, keep the default block and add your customization via `APPEND_SYSTEM.md`. If you fully replace with `SYSTEM.md`, you must hard-code any skill names/instructions you want the model to know about, and those will not track discovery automatically.
### "Customize automatic session titles"
`SYSTEM.md` and `APPEND_SYSTEM.md` do not affect the model call that names a new session. Create the title-specific prompt file instead:
```text
# ~/.omp/agent/TITLE_SYSTEM.md
Generate a session name using lowercase `<type>:<primary-objective>`.
If the message carries no concrete task, output exactly `none`.
```
`TITLE_SYSTEM.md` is discovered with the same project-then-user config-directory pattern as `SYSTEM.md` / `APPEND_SYSTEM.md`. When absent, OMP uses the bundled `title-system.md` / `tiny-title-system.md` prompts. When present, the online title path still forces the `set_title` tool call, and the local tiny-model path keeps the `<title>...</title>` wrapper while using this file as the system turn.
### "Replace everything, including project context" — SDK-only
The normal CLI file/flag path intentionally preserves `defaultPrompt.slice(1)`. Code using `CreateAgentSessionOptions.systemPrompt` directly can return a full replacement array and omit the project footer, but that is not what `.omp/SYSTEM.md`, `~/.omp/agent/SYSTEM.md`, or `--system-prompt` do.
@@ -163,6 +175,7 @@ Net effect for CLI users: put `SYSTEM.md` / `APPEND_SYSTEM.md` directly under `<
| Add an instruction on top of the full default prompt | `APPEND_SYSTEM.md` or `--append-system-prompt` |
| Replace the stable default instructions but keep project/environment context | `SYSTEM.md` or `--system-prompt` |
| Preserve generated skills/rules/tool guidance while customizing | `APPEND_SYSTEM.md`; `SYSTEM.md` replaces that generated block |
| Customize automatic session titles | `TITLE_SYSTEM.md`; chat-turn `SYSTEM.md` / `APPEND_SYSTEM.md` do not affect title generation |
| Use `{{cwd}}` / `{{date}}` / other internals in my file | Not supported. Files are inserted verbatim. |
| Inherit specific sections from `system-prompt.md` | Not supported; use append, or copy what you need into `SYSTEM.md`. |
| Override at a per-repo level | Project `.omp/SYSTEM.md` under the cwd you launch `omp` from |