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feat(hooks): add systemPromptAppend to before_agent_start, full tool registry

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- before_agent_start handlers can return systemPromptAppend to dynamically
  append text to the system prompt for that turn
- Multiple hooks' systemPromptAppend strings are concatenated
- Multiple hooks' messages are now all injected (not just first)
- Tool registry now contains ALL built-in tools (read, bash, edit, write,
  grep, find, ls) regardless of --tools flag
- --tools only sets initially active tools, hooks can enable any via
  setActiveTools()
- System prompt automatically rebuilds when tools change, updating tool
  descriptions and guidelines
- Add pirate.ts example hook demonstrating systemPromptAppend
- Update hooks.md with systemPromptAppend documentation
This commit is contained in:
Mario Zechner 2026-01-04 18:21:26 +01:00
parent 892acedb6b
commit e4dd21a3b2
7 changed files with 136 additions and 20 deletions
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11
packages/coding-agent/CHANGELOG.md
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@ -2,6 +2,17 @@
## [Unreleased]
### Added
- Hook API: `before_agent_start` handlers can now return `systemPromptAppend` to dynamically append text to the system prompt for that turn. Multiple hooks' appends are concatenated.
- New example hook: `pirate.ts` demonstrates using `systemPromptAppend` to make the agent speak like a pirate when `/pirate` mode is enabled
- Tool registry now contains all built-in tools (read, bash, edit, write, grep, find, ls) even when `--tools` limits the initially active set. Hooks can enable any tool from the registry via `pi.setActiveTools()`.
- System prompt now automatically rebuilds when tools change via `setActiveTools()`, updating tool descriptions and guidelines to match the new tool set
### Changed
- Removed image placeholders after copy & paste, replaced with inserting image file paths directly. ([#442](https://github.com/badlogic/pi-mono/pull/442) by [@mitsuhiko](https://github.com/mitsuhiko))
### Fixed
- Fixed potential text decoding issues in bash executor by using streaming TextDecoder instead of Buffer.toString()