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story-kit: create 180_bug_web_ui_permissions_handling_unreliable

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Dave
2026-02-25 12:08:03 +00:00
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.story_kit/work/1_upcoming/180_bug_web_ui_permissions_handling_unreliable.md
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@@ -9,7 +9,39 @@ name: "Web UI permissions handling unreliable"
Permissions handling in the web UI chat has issues. This is a tracking bug to collect specific problems as they're encountered.
Known issues:
1. **Batch tool calls failing**: When the agent fires many parallel Bash calls (e.g. 11 at once), the permission/hook validation system fails with cryptic errors (`invalid_union`, `Invalid input: expected "allow"`), cascading to cancel all sibling calls. Individual calls with the same commands work fine. Unclear if this is a Claude Code SDK limitation, a hook validation issue, or a web UI problem.
1. **Batch tool calls failing**: When the agent fires many parallel Bash calls (e.g. 11 at once), two problems compound:
- **Trigger**: The first call fails with an `invalid_union` permission/hook validation error. This may be a bug in how the permission hook response is parsed when many parallel requests hit it simultaneously.
- **Cascade**: All remaining sibling calls are cancelled with "Sibling tool call errored". This is a known Claude Code bug ([anthropics/claude-code#22264](https://github.com/anthropics/claude-code/issues/22264), 25 upvotes, still open). Claude Code uses an all-or-nothing batch model — if one parallel call fails, all siblings are killed.
The cascade is an upstream issue we can't fix. But the **trigger** (the `invalid_union` error) may be something in our permission hook handling that we can investigate.
## How to reproduce
Ask the agent to check git status across all worktrees. It will attempt to run 11+ parallel Bash calls like:
```
git -C .story_kit/worktrees/163_story_foo status --porcelain
git -C .story_kit/worktrees/165_bug_bar status --porcelain
git -C .story_kit/worktrees/166_story_baz status --porcelain
... (11 total)
```
Each command individually works fine and matches the `Bash(git *)` permission rule. But when all 11 are fired in a single parallel batch, they all fail with:
```json
{
"code": "invalid_union",
"errors": [
[{ "code": "invalid_value", "values": ["allow"], "path": ["behavior"], "message": "Invalid input: expected \"allow\"" }],
[{ "code": "invalid_value", "values": ["deny"], "path": ["behavior"], "message": "Invalid input: expected \"deny\"" },
{ "expected": "string", "code": "invalid_type", "path": ["message"], "message": "Invalid input: expected string, received undefined" }]
]
}
```
The first call gets this error, and all remaining calls fail with `"Sibling tool call errored"`.
Running the same commands in batches of 3 works fine.
## How to reproduce