[BUG] toolUseContext.getAppState is not a function — React effect cleanup race during permission prompt (v2.1.111)

Summary

TypeError: q.toolUseContext.getAppState is not a function is thrown during permission-prompt rendering in v2.1.111. Appears to be a React commit-phase effect cleanup race involving stale toolUseContext closures.

Version

@anthropic-ai/claude-code@2.1.111 — npm global install, macOS (darwin-arm64), Node 22 (homebrew)

Stack Trace

ERROR q.toolUseContext.getAppState is not a function
file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:8493:15619

 -  (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:8493:15619)
 - S0 (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:551:63170)
 - G06 (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:551:76223)
 - yN (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:551:76103)
 - G06 (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:551:76202)
 - yN (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:551:76103)
 - G06 (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:551:76202)
 - yN (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:551:76103)
 - G06 (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:551:76202)
 - yN (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:551:76103)

Root Cause Analysis

Error site — cli.js:8493

let Y = q.toolUseContext.getAppState().toolPermissionContext.mode;
d("tengu_tool_use_show_permission_request", {
  messageID: q.assistantMessage.message.id,
  toolName: PK(q.tool.name),
  isMcp: q.tool.isMcp ?? !1,
  decisionReasonType: q.permissionResult.decisionReason?.type,
  sandboxEnabled: Z7.isSandboxingEnabled(),
  ...
});

Permission-prompt display code path reads toolPermissionContext.mode from q.toolUseContext. The object q.toolUseContext exists but the method getAppState is missing — suggesting the context was replaced with an incompatible shape, or cleaned up before this call site executed.

Call stack — cli.js:551 (React Fiber traversal)

function yN(b,I,Q,a){
  if (I.subtreeFlags & 10256)
    for (I = I.child; I !== null;) G06(b,I,Q,a), I = I.sibling
}
function G06(b,I,Q,a){
  var Z6 = I.flags;
  switch (I.tag) {
    case 0: case 11: case 15:
      yN(b,I,Q,a), Z6 & 2048 && S0(9,I); break;
    case 1: yN(b,I,Q,a); break;
    case 3: yN(b,I,Q,a), Z6 & 2048 && ( ...cache refCount work... ); break;
    ...
  }
}

Patterns subtreeFlags & 10256, flags & 2048, and S0(9, I) match React's commit-phase effect cleanup (passive/layout destroy effects). The mutual recursion between yN and G06 is a depth-first fiber tree walk. S0(9, I) is an effect destroy invocation.

Scenario

During the React commit phase (unmount or re-render), a cleanup/destroy effect closure holds a stale reference to a toolUseContext object. By the time the effect runs, the context has been replaced with a newer-shaped object (or the old one has been partially torn down), and getAppState is no longer present on it.

Reproduction

The error consistently appears when using TeamCreate (multi-agent team spawn) with agents that trigger permission prompts concurrently. Individual sequential Agent tool spawns do not reproduce the error in my testing.

Session state at error:

• 4 parallel claude sessions running (all with bypass permissions on)
• Affected session was attempting to spawn a multi-agent team for an ad-campaign review task
• Error surfaced mid-execution, terminating that session's tool use loop

Related Issues

• #12176 — PermissionRequest Hook Race Condition (same subsystem)
• #17129 — Tool use recursion error (tool-use context related)

Workarounds

1. Downgrade: npm i -g @anthropic-ai/claude-code@2.1.110
2. Avoid concurrent multi-agent teams; spawn individual Agents sequentially

Environment

• OS: macOS 15 (Darwin 25.5.0), arm64
• Node: v22 (homebrew)
• Install: npm i -g @anthropic-ai/claude-code@2.1.111
• Shell: zsh

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Stack analysis performed against the installed cli.js bundle. Happy to provide additional bytes around the error site or a minimal repro if useful.