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## Summary
- Guard `toolInfoFromToolUse()` against `undefined` input for Read,
Glob, Grep, WebSearch, and TodoWrite cases
- Make `planEntries()` resilient to `undefined` input (returns `[]`
instead of crashing)
- Guard TodoWrite plan updates in `streamEventToAcpNotifications()` with
optional chaining on `chunk.input?.todos`
## Why this change
Claude `tool_use` blocks can temporarily carry `input: undefined` during
streaming (before `input_json_delta` arrives), and historical `tool_use`
messages with incomplete input may be replayed when a JetBrains IDEA
session is resumed. Without these guards, ACP crashes with:
```
TypeError: Cannot read properties of undefined (reading 'limit')
TypeError: Cannot read properties of undefined (reading '-i')
TypeError: Cannot read properties of undefined (reading 'todos')
```
All three crashes share the same root cause: the ACP bridge assumes
`tool_use.input` is always defined, but it can be `undefined` during
streaming early chunks or session history replay.
## Test plan
- [x] Added regression tests for `toolInfoFromToolUse()` with `input:
undefined` (Read, Grep, Glob, WebSearch, TodoWrite)
- [x] Added regression test for `planEntries(undefined)` — returns `[]`
- [x] Added regression test for `planEntries({})` — graceful handling
- [x] Added regression test for `toAcpNotifications()` with TodoWrite +
undefined input — no crash, no spurious plan update
- [x] Added regression test verifying TodoWrite + valid input still
emits plan update
- [x] `npm run build` passes with no TypeScript errors
- [x] All 167 tests pass (10 new)
🤖 Generated with [Claude Code](https://claude.com/claude-code)
---------
Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
Co-authored-by: Ben Brandt <benjamin.j.brandt@gmail.com>
ACP adapter for the Claude Agent SDK
Use Claude Agent SDK from ACP-compatible clients!
This tool implements an ACP agent by using the official Claude Agent SDK, supporting:
- Context @-mentions
- Images
- Tool calls (with permission requests)
- Following
- Edit review
- TODO lists
- Interactive (and background) terminals
- Custom Slash commands
- Client MCP servers
Learn more about the Agent Client Protocol.
Contribution Policy
This project does not require a Contributor License Agreement (CLA). Instead, contributions are accepted under the following terms:
By contributing to this project, you agree that your contributions will be licensed under the Apache License, Version 2.0. You affirm that you have the legal right to submit your work, that you are not including code you do not have rights to, and that you understand contributions are made without requiring a Contributor License Agreement (CLA).