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claude-code - 💡(How to fix) Fix `Unhandled node type: string` triggers across 4 distinct bash structures [1 comments, 2 participants]

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anthropics/claude-code#56018•Fetched 2026-05-05 06:00:19
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The hook message Unhandled node type: string appears in the command confirmation prompt for at least four structurally distinct bash patterns. Each triggers the same message, which makes it difficult to tell from the prompt which structure is the root cause. Listing them here in case it helps maintainers identify whether one code path covers all four or each is a separate gap.

Error Message

Expected: passes without error, or prompts with a message specific to nested same-type quotes. Expected: passes without error, or prompts with a message specific to complex loop bodies. Expected: passes without error (standard BRE syntax). Expected: passes without error. None of those enumerate which bash structures produce this error. Listing the four structures here

Root Cause

The hook message Unhandled node type: string appears in the command confirmation prompt for at least four structurally distinct bash patterns. Each triggers the same message, which makes it difficult to tell from the prompt which structure is the root cause. Listing them here in case it helps maintainers identify whether one code path covers all four or each is a separate gap.

Code Example

echo "value: $(echo "$HOME")"

---

for f in a.txt \
  b.txt; do
  grep -c "hello" "$f" | head -1
done

---

grep "alpha\|beta" file.txt

---

BASE=$(dirname "$(git rev-parse --git-common-dir)")
RAW_BUFFERClick to expand / collapse

Summary

The hook message Unhandled node type: string appears in the command confirmation prompt for at least four structurally distinct bash patterns. Each triggers the same message, which makes it difficult to tell from the prompt which structure is the root cause. Listing them here in case it helps maintainers identify whether one code path covers all four or each is a separate gap.

Reproduction

Structure (a) -- same-type nested quotes: "outer $(cmd "$VAR")"

echo "value: $(echo "$HOME")"

Expected: passes without error, or prompts with a message specific to nested same-type quotes.
Observed: Unhandled node type: string

Structure (b) -- for-loop with \ line continuation and a pipe in the body

for f in a.txt \
  b.txt; do
  grep -c "hello" "$f" | head -1
done

Expected: passes without error, or prompts with a message specific to complex loop bodies.
Observed: Unhandled node type: string

Structure (c) -- BRE alternation (\|) inside a double-quoted grep pattern

grep "alpha\|beta" file.txt

Expected: passes without error (standard BRE syntax).
Observed: Unhandled node type: string

Structure (d) -- reverse same-type nesting: $(outer "$(inner)")

BASE=$(dirname "$(git rev-parse --git-common-dir)")

Expected: passes without error.
Observed: Unhandled node type: string

Notes

Related symptom reports that surface the same message: #42085, #43246, #50144, #55479, #49483. None of those enumerate which bash structures produce this error. Listing the four structures here in case it accelerates root-cause analysis.

Environment

  • claude-code version: 2.1.118
  • OS: macOS 26.4.1
  • Shell: /bin/zsh
  • Notes: heavy use of git worktrees and multiple language toolchains

extent analysis

TL;DR

The issue can be mitigated by identifying and handling the specific bash structures that trigger the "Unhandled node type: string" message, such as nested quotes, complex loop bodies, BRE alternation, and reverse same-type nesting.

Guidance

  • Review the provided bash structures (a, b, c, d) to understand which patterns trigger the error and adjust the code accordingly.
  • Consider updating the claude-code version to a newer release, as the issue may have been addressed in a later version.
  • Verify the error message for each structure to determine if a single code path or multiple gaps are responsible for the issue.
  • Check the related symptom reports (#42085, #43246, #50144, #55479, #49483) for potential workarounds or insights.

Example

No code snippet is provided as the issue is more related to understanding and handling specific bash structures rather than a specific code fix.

Notes

The issue seems to be related to the claude-code version (2.1.118) and the specific bash structures used. The error message "Unhandled node type: string" is not very descriptive, making it difficult to pinpoint the exact cause.

Recommendation

Apply workaround: The best course of action is to identify and handle the specific bash structures that trigger the error, as updating the claude-code version may not be feasible or may not address the issue directly.

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claude-code - 💡(How to fix) Fix `Unhandled node type: string` triggers across 4 distinct bash structures [1 comments, 2 participants]