claude-code - 💡(How to fix) Fix [DOCS] Bash permission docs omit env-var prefix matching semantics [1 participants]

Documentation Type

Incorrect/outdated documentation

Documentation Location

https://code.claude.com/docs/en/permissions

Section/Topic

Permission rule syntax and Tool-specific permission rules → Bash

Current Documentation

The docs currently say:

Bash permission rules support wildcard matching with *. Wildcards can appear at any position in the command, including at the beginning, middle, or end:

• Bash(npm run build) matches the exact Bash command npm run build
• Bash(npm run test *) matches Bash commands starting with npm run test
• Bash(npm *) matches any command starting with npm
• Bash(* install) matches any command ending with install
• Bash(git * main) matches commands like git checkout main, git merge main

It also says:

Claude Code is aware of shell operators (like &&) so a prefix match rule like Bash(safe-cmd *) won't give it permission to run the command safe-cmd && other-cmd.

And the same page warns:

Bash permission patterns that try to constrain command arguments are fragile.

• Redirects: curl -L http://bit.ly/xyz (redirects to github)

What's Wrong or Missing?

Changelog v2.1.97 says Claude Code "Fixed and hardened Bash tool permissions, tightening checks around env-var prefixes and network redirects, and reducing false prompts on common commands."

The permissions page documents wildcard matching, shell-operator handling, and one redirect caveat, but it does not explain the matching semantics for commands that start with environment-variable assignments such as FOO=bar git push.

That omission matters because users rely on these rules to decide which Bash commands should be covered by a given allow or deny pattern. Today the page gives examples only for bare commands, so it is unclear whether leading env-var prefixes are ignored, normalized, or treated as part of the literal command string.

The redirect warning is also underspecified after the v2.1.97 hardening work. The page still lists redirects only as a generic fragility example, without clarifying what is now enforced versus what still requires WebFetch(domain:...), deny rules for network tools, or a PreToolUse hook.

Suggested Improvement

Add a short subsection under Bash permission rules that documents command-normalization behavior before rule matching.

Suggested coverage:

• State whether leading environment-variable assignments are ignored for matching, with examples such as FOO=bar git push origin main and AWS_PROFILE=prod aws s3 ls.
• Clarify how Bash permission rules treat leading env-var prefixes before matching.
• Update the redirect caveat to distinguish current behavior after v2.1.97 from remaining unsupported or unsafe cases.
• Add one example showing the recommended safe pattern for network access control: deny Bash network tools, use WebFetch(domain:...) for allowed domains, and fall back to hooks for stricter validation.

Impact

Medium - Makes feature difficult to understand

Additional Context

Affected Pages:

Total scope: 2 pages affected

Source: Changelog v2.1.97

Changelog entry: Fixed and hardened Bash tool permissions, tightening checks around env-var prefixes and network redirects, and reducing false prompts on common commands