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SECURITY AND PRIVACY / Trail of Bits

Semgrep Rule Creator

Turns a concrete bug pattern into a Semgrep rule with positive and negative test cases.

“Creates custom Semgrep rules for detecting security vulnerabilities, bug patterns, and code patterns. Use when writing Semgrep rules or building custom static analysis detections.”

01 / THE REASONING

Why this made the selection.

  • Requires vulnerable and safe examples before rule implementation, then runs Semgrep validation and rule tests.
  • Separates syntax inspection, pattern construction and simplification so changes can be checked against the same fixtures.

02 / THE REVIEW RECORD

What we actually inspected.

Source review has boundaries.
A clear record is more useful than a “safe” badge.

Material inspected

  • Full SKILL.md
  • references/workflow.md
  • references/quick-reference.md
  • Rule and test guidance in the references
  • LICENSE
  • plugins/semgrep-rule-creator/skills/semgrep-rule-creator/references/workflow.md

Our findings

  • The procedure includes semgrep --validate and semgrep --test and requires rerunning tests after simplification.
  • The workflow reference requires vulnerable and safe cases, nesting and coding-style variations, then validation, test execution and post-pass simplification.
  • It requires one Semgrep rule per YAML file and forbids todoruleid and todook annotations in test files.

Not established by this review

  • No end-to-end agent session, effectiveness benchmark or target-project security assessment was run.
  • No upstream installer, helper script or generated workload was executed.

The review applies to the material and revision named here. A newer upstream release can change its behavior.

03 / PUT IT TO WORK

Add a skill to your workflow.

Upstream setup instructions ↗

DOCUMENTED COMMAND

npx skills add trailofbits/skills/plugins/semgrep-rule-creator/skills/semgrep-rule-creator --skill semgrep-rule-creator

Run in your terminal to choose your AI tools, project or global scope, and installation method. This short command follows the current upstream version; the review covers the revision shown above.

Optional: install the reviewed revision

Keeps the original source and installer version where recorded, while leaving your AI tools and installation scope for you to choose.

npx skills add https://github.com/trailofbits/skills/tree/82fe8226252622fa807643bdca1710901198553a/plugins/semgrep-rule-creator/skills/semgrep-rule-creator --skill semgrep-rule-creator
  1. Inspect the selected skill version and its supporting files before installation.
  2. Run the command in your terminal; choose your AI tools and project or global scope in the installer.
  3. Keep the complete skill directory and its licence. Install any task-specific tools separately and test on a small authorized example.
  4. For manual installation instead, download the complete bundle from https://undominated.ai/resources/skills/trailofbits-semgrep-rule-creator/bundle.zip and extract it into a new directory. It holds SKILL.md and 3 supporting files unchanged at revision 82fe8226, the upstream licence and an attribution file.
  5. Place the extracted directory in your host's documented skills directory, named semgrep-rule-creator. Keep SKILL.md and the licence together.

Before you start

  • Node.js and npm for the Skills CLI
  • An Agent Skills compatible coding assistant
  • Semgrep with support for the target language
  • Network access for the seven documentation pages Step 1 fetches

THE COMPLETE REVIEWED DEFINITION

Read it before you reuse it.

Original source bytes, with attribution.
Review the host-specific setup notes above.

---
name: semgrep-rule-creator
description: Creates custom Semgrep rules for detecting security vulnerabilities, bug patterns, and code patterns. Use when writing Semgrep rules or building custom static analysis detections.
allowed-tools: Bash Read Write Edit Glob Grep WebFetch
---

# Semgrep Rule Creator

Create production-quality Semgrep rules with proper testing and validation.

## When to Use

**Ideal scenarios:**
- Writing Semgrep rules for specific bug patterns
- Writing rules to detect security vulnerabilities in your codebase
- Writing taint mode rules for data flow vulnerabilities
- Writing rules to enforce coding standards

## When NOT to Use

Do NOT use this skill for:
- Running existing Semgrep rulesets
- General static analysis without custom rules (use `static-analysis` skill)

## Rationalizations to Reject

When writing Semgrep rules, reject these common shortcuts:

- **"The pattern looks complete"** → Still run `semgrep --test --config <rule-id>.yaml <rule-id>.<ext>` to verify. Untested rules have hidden false positives/negatives.
- **"It matches the vulnerable case"** → Matching vulnerabilities is half the job. Verify safe cases don't match (false positives break trust).
- **"Taint mode is overkill for this"** → If data flows from user input to a dangerous sink, taint mode gives better precision than pattern matching.
- **"One test is enough"** → Include edge cases: different coding styles, sanitized inputs, safe alternatives, and boundary conditions.
- **"I'll optimize the patterns first"** → Write correct patterns first, optimize after all tests pass. Premature optimization causes regressions.
- **"The AST dump is too complex"** → The AST reveals exactly how Semgrep sees code. Skipping it leads to patterns that miss syntactic variations.

## Anti-Patterns

**Too broad** - matches everything, useless for detection:
```yaml
# BAD: Matches any function call
pattern: $FUNC(...)

# GOOD: Specific dangerous function
pattern: eval(...)
```

**Missing safe cases in tests** - leads to undetected false positives:
```python
# BAD: Only tests vulnerable case
# ruleid: my-rule
dangerous(user_input)

# GOOD: Include safe cases to verify no false positives
# ruleid: my-rule
dangerous(user_input)

# ok: my-rule
dangerous(sanitize(user_input))

# ok: my-rule
dangerous("hardcoded_safe_value")
```

**Overly specific patterns** - misses variations:
```yaml
# BAD: Only matches exact format
pattern: os.system("rm " + $VAR)

# GOOD: Matches all os.system calls with taint tracking
mode: taint
pattern-sources:
  - pattern: input(...)
pattern-sinks:
  - pattern: os.system(...)
```

## Strictness Level

This workflow is **strict** - do not skip steps:
- **Read documentation first**: See [Documentation](#documentation) before writing Semgrep rules
- **Test-first is mandatory**: Never write a rule without tests
- **100% test pass is required**: "Most tests pass" is not acceptable
- **Optimization comes last**: Only simplify patterns after all tests pass
- **Avoid generic patterns**: Rules must be specific, not match broad patterns
- **Prioritize taint mode**: For data flow vulnerabilities
- **One YAML file - one Semgrep rule**: Each YAML file must contain only one Semgrep rule; don't combine multiple rules in a single file
- **No generic rules**: When targeting a specific language for Semgrep rules - avoid generic pattern matching (`languages: generic`)
- **Forbidden `todook` and `todoruleid` test annotations**: `todoruleid: <rule-id>` and `todook: <rule-id>` annotations in tests files for future rule improvements are forbidden

## Overview

This skill guides creation of Semgrep rules that detect security vulnerabilities and code patterns. Rules are created iteratively: analyze the problem, write tests first, analyze AST structure, write the rule, iterate until all tests pass, optimize the rule.

**Approach selection:**
- **Taint mode** (prioritize): Data flow issues where untrusted input reaches dangerous sinks
- **Pattern matching**: Simple syntactic patterns without data flow requirements

**Why prioritize taint mode?** Pattern matching finds syntax but misses context. A pattern `eval($X)` matches both `eval(user_input)` (vulnerable) and `eval("safe_literal")` (safe). Taint mode tracks data flow, so it only alerts when untrusted data actually reaches the sink—dramatically reducing false positives for injection vulnerabilities.

**Iterating between approaches:** It's okay to experiment. If you start with taint mode and it's not working well (e.g., taint doesn't propagate as expected, too many false positives/negatives), switch to pattern matching. Conversely, if pattern matching produces too many false positives on safe cases, try taint mode instead. The goal is a working rule—not rigid adherence to one approach.

**Output structure** - exactly 2 files in a directory named after the rule-id:
```
<rule-id>/
├── <rule-id>.yaml     # Semgrep rule
└── <rule-id>.<ext>    # Test file with ruleid/ok annotations
```

## Quick Start

```yaml
rules:
  - id: insecure-eval
    languages: [python]
    severity: HIGH
    message: User input passed to eval() allows code execution
    mode: taint
    pattern-sources:
      - pattern: request.args.get(...)
    pattern-sinks:
      - pattern: eval(...)
```

Test file (`insecure-eval.py`):
```python
# ruleid: insecure-eval
eval(request.args.get('code'))

# ok: insecure-eval
eval("print('safe')")
```

Run tests (from rule directory): `semgrep --test --config <rule-id>.yaml <rule-id>.<ext>`

## Quick Reference

- For commands, pattern operators, and taint mode syntax, see [quick-reference.md]({baseDir}/references/quick-reference.md).
- For detailed workflow and examples, you MUST see [workflow.md]({baseDir}/references/workflow.md)

## Workflow

Copy this checklist and track progress:

```
Semgrep Rule Progress:
- [ ] Step 1: Analyze the Problem
- [ ] Step 2: Write Tests First
- [ ] Step 3: Analyze AST structure
- [ ] Step 4: Write the rule
- [ ] Step 5: Iterate until all tests pass (semgrep --test)
- [ ] Step 6: Optimize the rule (remove redundancies, re-test)
- [ ] Step 7: Final Run
```

## Documentation

**REQUIRED**: Before writing any rule, use WebFetch to read **all** of these 7 links with Semgrep documentation:

1. [Rule Syntax](https://raw.githubusercontent.com/semgrep/semgrep-docs/refs/heads/main/docs/writing-rules/rule-syntax.mdx)
2. [Pattern Syntax](https://raw.githubusercontent.com/semgrep/semgrep-docs/refs/heads/main/docs/writing-rules/pattern-syntax.mdx)
3. [Testing Rules](https://raw.githubusercontent.com/semgrep/semgrep-docs/refs/heads/main/docs/writing-rules/testing-rules.mdx)
4. [Taint analysis](https://raw.githubusercontent.com/semgrep/semgrep-docs/refs/heads/main/docs/writing-rules/data-flow/taint-mode/overview.mdx)
5. [Advanced techniques for taint analysis](https://raw.githubusercontent.com/semgrep/semgrep-docs/refs/heads/main/docs/writing-rules/data-flow/taint-mode/advanced.mdx)
6. [Constant propagation](https://raw.githubusercontent.com/semgrep/semgrep-docs/refs/heads/main/docs/writing-rules/data-flow/constant-propagation.mdx)
7. [Trail of Bits Testing Handbook - Semgrep chapter](https://raw.githubusercontent.com/trailofbits/testing-handbook/refs/heads/main/content/docs/static-analysis/semgrep/10-advanced.md)

The download contains SKILL.md. Extract the whole bundle; the supporting files are required. Inspect the included MANIFEST.json for file hashes.

By Trail of Bits. Exact upstream source ↗ · Licence · Attribution

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04 / FOLLOW THE EVIDENCE

The source trail.

Our notes are separate from the original resource.
Check upstream before adopting a new version.

  1. https://github.com/trailofbits/skills/blob/82fe8226252622fa807643bdca1710901198553a/plugins/semgrep-rule-creator/skills/semgrep-rule-creator/SKILL.md

    Supports: summary, upstreamDescription, whySelected, bestFor, limitations, review, access

  2. https://github.com/trailofbits/skills/blob/82fe8226252622fa807643bdca1710901198553a/LICENSE

    Supports: license, access.cost

  3. https://github.com/vercel-labs/skills#readme

    Supports: install, compatibility

  4. https://github.com/trailofbits/skills/blob/82fe8226252622fa807643bdca1710901198553a/plugins/semgrep-rule-creator/skills/semgrep-rule-creator/references/workflow.md

    Supports: review, limitations, access, install

Evidence & Ask