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Rule Reference

SEC427lintai-ai-securitygovernancehardeningstablemarkdownwarn

AI markdown: bare Grep tool grant

AI-native markdown frontmatter grants bare `Grep` tool access

Public lane
governance
Category
hardening
Provider
lintai-ai-security
Scope
per-file
Surface
markdown
Tier
stable
Severity
warn
Confidence
high
Detection
structural
Remediation
message only
How to read this lane

Shared authority and workflow policy review.

How to read this category

Least-privilege, provenance, or operational hygiene signal.

Activation Model

Preset Activation

These presets explain where this rule appears in the product experience.

governancesidecar lane

Lifecycle

Stable Lifecycle Contract

State

stable

Graduation rationale

Checks AI-native frontmatter for bare Grep grants that omit a reviewed search scope.

Deterministic signal basis

MarkdownSignals exact frontmatter token detection for bare `Grep` inside allowed-tools or allowed_tools.

Malicious corpus
skill-unscoped-grep-allowed-tools
Benign corpus
skill-unscoped-grep-allowed-tools-specific-safe
structured evidence required remediation reviewed
Canonical note

Structural stable rule intended as a high-precision check with deterministic evidence.

Nearby Signals

Related Rules

SEC352AI markdown: unscoped Bash tool grantAI-native markdown frontmatter grants unscoped Bash tool accessgovernancehardeningmarkdown
SEC423AI markdown: bare Read tool grantAI-native markdown frontmatter grants bare `Read` tool accessgovernancehardeningmarkdown
SEC424AI markdown: bare Write tool grantAI-native markdown frontmatter grants bare `Write` tool accessgovernancehardeningmarkdown
SEC425AI markdown: bare Edit tool grantAI-native markdown frontmatter grants bare `Edit` tool accessgovernancehardeningmarkdown
SEC426AI markdown: bare Glob tool grantAI-native markdown frontmatter grants bare `Glob` tool accessgovernancehardeningmarkdown
SEC428AI markdown: unsafe Read path grantAI-native markdown frontmatter grants `Read(...)` over an unsafe repo-external pathgovernancehardeningmarkdown

SEC427 / MD-GREP-UNSCOPED ​

SEC427 flags AI-native markdown frontmatter when allowed-tools or allowed_tools grants bare Grep.

This rule intentionally lives in the opt-in governance preset. Shared skills often need search capabilities, but repo-wide default grep authority is a policy choice that deserves explicit review rather than headline security treatment.

Why It Matters ​

Bare Grep is a broad content-search grant. In shared skills and instruction files, it turns open-ended repository search into default policy instead of a narrower reviewed grep scope.

Trigger Shape ​

  • AI-native markdown surface with parsed frontmatter
  • path is not fixture-like
  • allowed-tools or allowed_tools contains the exact token Grep

Clean Cases ​

  • scoped patterns such as Grep(todo:)
  • frontmatter that does not grant bare Grep
  • fixture-like examples under test or fixture paths

Example Trigger ​

md
---
allowed-tools: Grep, Read(./docs/**)
---

Safer Example ​

md
---
allowed-tools: Grep(todo:), Read(./docs/**)
---

How To Fix ​

Review whether shared bare Grep authority is really needed, or replace it with narrower workflow-specific search patterns instead of a default repo-wide grant.