Semgrep
MCP ServerFree** - Enable AI agents to secure code with [Semgrep](https://semgrep.dev/).
Capabilities9 decomposed
static code pattern matching via semgrep rules
Medium confidenceExecutes Semgrep's pattern-based static analysis engine through MCP protocol, allowing AI agents to run custom YAML-defined rules against codebases to detect security vulnerabilities, code quality issues, and compliance violations. Uses Semgrep's proprietary syntax (combining regex, metavariables, and structural patterns) to match code across 30+ languages without requiring AST compilation by the agent itself.
Exposes Semgrep's full rule engine through MCP protocol, enabling AI agents to leverage 2000+ community rules and custom YAML patterns without reimplementing pattern matching logic; integrates directly with Semgrep's managed rule registry for automatic updates
Provides deeper pattern matching than generic linters (handles semantic patterns across languages) while remaining fully local and agent-controllable, unlike cloud-based SAST tools that require code transmission
multi-language code scanning with language-specific rule sets
Medium confidenceRoutes code analysis through Semgrep's language detection and rule filtering system, automatically selecting and applying language-specific rule sets (Python, JavaScript, Java, Go, C#, etc.) based on file extension or content analysis. MCP integration allows agents to scan polyglot codebases without manually specifying which rules apply to which files.
Implements automatic language detection and rule routing without requiring agent configuration; Semgrep's rule taxonomy is pre-organized by language, allowing MCP to expose language-specific rule subsets dynamically based on codebase composition
Handles polyglot codebases more intelligently than language-specific tools (e.g., Pylint for Python only) while avoiding the overhead of running all rules against all files like generic AST-based scanners
real-time vulnerability remediation suggestions via ai integration
Medium confidenceCombines Semgrep findings with LLM context to generate code fix suggestions, leveraging the MCP protocol to pass vulnerability metadata (location, pattern, severity) to the AI agent, which then generates contextual remediation code. Semgrep provides structured finding data (line number, matched code, rule ID) that the agent uses to construct targeted fix prompts.
MCP integration enables bidirectional flow: Semgrep provides structured vulnerability metadata to the agent, which then uses that context to prompt an LLM for fixes, creating a closed-loop security workflow without requiring separate tool orchestration
More flexible than Semgrep's built-in autofix feature (which is rule-specific) because it leverages general-purpose LLMs to generate fixes for any rule; more accurate than generic code-fixing LLMs because it grounds fixes in Semgrep's precise vulnerability detection
custom rule development and testing via mcp
Medium confidenceExposes Semgrep's rule validation and testing framework through MCP, allowing agents to create, validate, and test custom YAML rules against code samples without manual CLI invocation. Agents can iterate on rule definitions, run them against test cases, and receive structured feedback on rule syntax and matching accuracy.
MCP exposes Semgrep's rule validation and testing APIs, enabling agents to programmatically create and iterate on rules; combines rule development with testing in a single workflow, unlike Semgrep CLI which requires separate commands
Enables AI-driven rule generation and optimization, whereas traditional Semgrep usage requires manual rule authoring; more accessible than writing custom AST-based linters because Semgrep's pattern syntax is higher-level
codebase-wide security posture assessment and reporting
Medium confidenceAggregates Semgrep findings across an entire codebase to generate security posture reports, calculating metrics like vulnerability density (issues per KLOC), severity distribution, and trend analysis over time. MCP integration allows agents to request full-codebase scans and receive summarized metrics suitable for dashboards, compliance reports, and executive summaries.
MCP enables agents to request aggregated security metrics without manually parsing individual findings; Semgrep's structured output (JSON/SARIF) allows agents to compute custom metrics (density, trends, risk scoring) on top of raw findings
Provides more granular metrics than commercial SAST platforms (which often hide raw finding counts) while remaining fully local and agent-controllable; enables custom metric definitions unlike fixed dashboards in SaaS tools
integration with managed semgrep rule registry and updates
Medium confidenceConnects to Semgrep's managed rule registry (2000+ community rules, proprietary rules for Pro users) through MCP, allowing agents to fetch, update, and manage rule sets without manual downloads. Agents can subscribe to rule updates, check for new vulnerabilities matching their codebase, and maintain synchronized rule versions across scanning operations.
MCP abstracts Semgrep's registry API, allowing agents to fetch and manage rules programmatically; enables automatic rule synchronization without requiring agents to manage CLI commands or file systems directly
More convenient than manual rule management (downloading YAML files) and more flexible than static rule sets; provides access to Semgrep's curated rule library while maintaining agent control over which rules are applied
contextual code analysis with cross-file dependency tracking
Medium confidenceAnalyzes code patterns across file boundaries, tracking variable assignments, function calls, and data flow to detect vulnerabilities that span multiple files. MCP integration allows agents to request cross-file analysis for specific patterns (e.g., tainted data flow from user input to SQL query) without manually managing file dependencies.
Semgrep's cross-file analysis uses language-specific AST parsing and scope resolution to track data flow across file boundaries; MCP exposes this capability without requiring agents to implement their own dependency resolution
More accurate than regex-based cross-file searching because it understands code structure and scope; more practical than full symbolic execution because it uses pattern matching to identify likely vulnerabilities
automated compliance checking against security standards
Medium confidenceMaps Semgrep findings to compliance frameworks (OWASP Top 10, CWE, PCI-DSS, HIPAA, SOC 2) and generates compliance reports showing which standards are violated and remediation status. MCP integration allows agents to request compliance assessments and receive structured reports suitable for audit trails and compliance dashboards.
Semgrep's rule metadata includes CWE and OWASP mappings; MCP exposes these mappings to enable agents to generate compliance reports without manual cross-referencing; enables dynamic compliance assessment as rules are updated
More comprehensive than manual compliance checklists because it automatically maps findings to standards; more flexible than compliance-only tools because it combines vulnerability detection with compliance assessment
incremental scanning and change-based vulnerability detection
Medium confidenceScans only modified files or changed code sections to detect new vulnerabilities introduced in recent commits, reducing scanning time from minutes to seconds. MCP integration allows agents to request incremental scans by providing file change lists (from git diffs or file modification timestamps), enabling real-time feedback in CI/CD pipelines.
MCP enables agents to pass file change lists to Semgrep, which filters rule execution to changed files only; combines change detection with pattern matching to provide fast, targeted vulnerability detection without full-codebase re-scanning
Faster than full-codebase scanning for CI/CD gates; more accurate than simple diff-based filtering because it understands code structure and can detect vulnerabilities in changed code that affects unchanged code
Capabilities are decomposed by AI analysis. Each maps to specific user intents and improves with match feedback.
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Best For
- ✓Security teams building AI-powered code scanning agents
- ✓DevSecOps engineers integrating static analysis into LLM-based CI/CD workflows
- ✓Enterprise teams requiring on-premise code analysis without cloud transmission
- ✓Teams maintaining polyglot microservices or monorepos
- ✓AI agents building automated security dashboards across heterogeneous codebases
- ✓Developers needing language-agnostic security scanning in CI/CD pipelines
- ✓AI-powered code review systems that need to suggest fixes alongside findings
- ✓Automated remediation workflows in security-focused CI/CD
Known Limitations
- ⚠Requires Semgrep CLI to be installed and accessible on the agent's system — no pure Python/Node.js fallback
- ⚠Pattern matching performance degrades on very large codebases (>1M LOC) without proper rule optimization
- ⚠Custom rule development requires learning Semgrep's YAML syntax; no visual rule builder exposed through MCP
- ⚠No built-in incremental scanning — each invocation re-scans the entire target unless filtered by file path
- ⚠Language detection relies on file extensions; ambiguous cases (e.g., .js for both Node.js and browser code) may apply incorrect rule sets
- ⚠Performance scales linearly with number of files; scanning 10k+ files across 5+ languages can exceed 30 seconds
Requirements
Input / Output
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