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The claim that Claude Code’s Read deny rules let four of eleven routes through should be treated as an unverified test report, not a general product behavior. The available information does not identify the Claude Code version, exact deny pattern, eleven routes, or four reported successes. Official documentation does establish that deny rules block matching calls across permission modes, but the result depends on what the rule matches and which mechanism attempts the read.
What does the “4 of 11” result establish?
On its own, the number describes a reported outcome under unspecified test conditions. Without the original route list and configuration, it cannot show which paths succeeded, whether they were genuinely blocked by the same rule, or whether the outcome applies to other Claude Code versions or projects.
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The available sources do not independently reproduce the count. Treat references to grep -r, a Python file-reading one-liner, and CLAUDE.md @ imports as prompts for testing—not confirmation that those particular paths worked in the reported experiment.
What does a Claude Code deny rule block?
Claude Code’s SDK documentation says deny rules are evaluated before permission modes. A matching deny blocks the call even in bypassPermissions mode. The distinction between rule types matters: a bare tool-name deny removes that tool, while a scoped pattern blocks calls matching the pattern. Neither description, by itself, establishes that every other mechanism capable of reading a file is covered.
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Permission-mode documentation also describes recognized file-reading Bash commands and special handling for reads outside working directories when the relevant setting is enabled. That outside-read behavior is documented as requiring Claude Code v2.1.257 or later, so version and setting are necessary context when comparing results.
Why are Read, Bash, and @ imports separate test cases?
They use different mechanisms. A rule aimed at the native Read tool, a Bash command that reads file contents, and a memory-file import should not be assumed to share identical enforcement just because each can involve file contents.
| Path to examine | What it tests | What the available information establishes |
|---|---|---|
| Native Read tool | Whether the configured tool rule matches a direct Read call for the protected path. | Claude Code documents tool-name and scoped-pattern deny behavior; the exact rule in the reported test is not available. |
Bash reader such as grep -r |
Whether a recognized shell read is governed by the applicable permission rule or setting. | Documentation describes recognized file-reading Bash commands, but the report’s exact command, settings, and result are not established. |
| Python file-reading one-liner | Whether the attempt is recognized or handled as an arbitrary subprocess, and whether another control applies. | The third-party deny-probe PyPI description lists a Python reader as a test example; that is not proof of the reported outcome. |
CLAUDE.md @ import |
Whether an imported memory file supplies instructions, and separately whether the protected target’s contents are read. | Claude Code documents imports in CLAUDE.md; import support alone does not demonstrate a permission-rule bypass. |
Keep “instructions were loaded” separate from “the protected file was read.” An import chain involving memory files is not evidence of access to some other protected target unless the test observes that target’s contents.
How to check a Read deny rule without overstating the result
A useful test is reproducible and reports each attempt separately. Record enough context to distinguish a blocked call from a successful read through another path.
- Record the environment. Note the Claude Code version, project and working-directory context, permission mode, relevant settings, and exact deny rule.
- Choose a controlled target. Identify the protected file and define what would count as disclosure—for example, whether the target’s contents appear in the result. Do not treat an instruction file merely being loaded as proof that this target was read.
- List each route before testing. Separate native Read calls, recognized Bash readers, arbitrary scripts or subprocesses, and memory-file imports. Do not label a short list as the original eleven routes unless the original list is known.
- Run and log one attempt at a time. For every route, capture the attempted action, whether Claude Code blocked it, whether a prompt or approval appeared, and whether the protected contents were returned.
- Report scope and outcome together. State the version and settings alongside the route-by-route results. If a result depends on an outside-working-directory setting, identify that setting and version context.
This method reports what a particular configuration did; it does not turn one test into a universal guarantee about all file-reading paths.
What does auto mode change?
Anthropic’s engineering article on auto mode says that mode drops permission rules known to grant arbitrary code execution, including blanket shell access and wildcarded script interpreters. That is a qualification about risky allow rules in auto mode, not a guarantee that Read-deny coverage is complete—or a general explanation for the reported four successful routes.
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How should you interpret a reported bypass?
Ask whether the report shows the exact rule and route, identifies the Claude Code version and mode, and demonstrates that protected contents were actually returned. A blocked native Read call does not answer what happens through every shell command or script; a loaded CLAUDE.md instruction does not answer whether a separate protected file was accessed. Until those conditions are documented, the defensible conclusion is about the limits of the report, not a blanket claim that Read denies are bypassable.
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