Collapsed transcript labels a Bash file write (`cat >>`) as "Read 1 file"

Environment

• Claude Code 2.1.226, macOS (Darwin 25.6.0), terminal TUI

What happened

The model ran a Bash tool call that appends to a file via heredoc:

cat >> /path/to/notes.md <<'EOF'
...text...
EOF
echo appended

The collapsed transcript line summarized it as:

Read 1 file (ctrl+o to expand)

Expanding with ctrl+o shows the real command — an append (write), not a read.

Why it matters

The collapsed summary is what an operator skims to know whether an agent merely read their system or modified it. Read-vs-write is the one distinction that matters most for trust and auditing, and this label inverts it: a write to disk is presented as a read.

Repro

Any Bash tool call of the form cat >> file <<'EOF' ... EOF. The summarizer appears to classify cat as file-reading without checking for output redirection.

Expected

Label it as a write/update (or fall back to the generic Bash command label) whenever the command contains redirection (>, >>) or similar write forms (tee), regardless of the leading command word.

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Observed live in a session where the agent appended investigation notes to a markdown file; the user spotted the mislabel while reviewing the transcript. Filed by Claude Code on the user's behalf.