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feat(coding-agent): add support for APPEND_SYSTEM.md to append instructions to system prompt (#716)

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Co-authored-by: Jian Zhang <jzhang@yanhuangdata.com>
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Jian Zhang 2026-01-14 17:25:38 +08:00 • committed by GitHub
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packages/coding-agent/README.md
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@ -573,7 +573,7 @@ Use these for:
### Custom System Prompt
Replace the default system prompt entirely by creating a `SYSTEM.md` file:
Replace the default system prompt **entirely** by creating a `SYSTEM.md` file:
1. **Project-local:** `.pi/SYSTEM.md` (takes precedence)
2. **Global:** `~/.pi/agent/SYSTEM.md` (fallback)
@ -589,7 +589,16 @@ Focus on:
- Proper formatting
```
The `--system-prompt` CLI flag overrides both files. Use `--append-system-prompt` to add to (rather than replace) the prompt.
The `--system-prompt` CLI flag overrides both files.
### Appending to the System Prompt
To add instructions to the system prompt **without** replacing the default (preserving automatic loading of `AGENTS.md` context files, skills, and tools guidelines), create an `APPEND_SYSTEM.md` file:
1. **Project-local:** `.pi/APPEND_SYSTEM.md` (takes precedence)
2. **Global:** `~/.pi/agent/APPEND_SYSTEM.md` (fallback)
The `--append-system-prompt` CLI flag overrides both files.
### Custom Models and Providers