FastApply

FastApply MCP Server is an enterprise-grade code intelligence platform that runs locally to analyze, search, and transform code across multiple languages. It combines local AI models, AST-based semantic search, and secure enterprise features to help you move faster with code comprehension, automated refactoring, and quality gates all inside your environment.

How to use

You connect to the FastApply MCP Server from an MCP client to perform AI-assisted edits, semantic searches, and security analyses across your codebase. Use the MCP client to send multi-file edits, run pattern-based searches, analyze code structure, and generate reports. The server is designed to work with Python, JavaScript, TypeScript, and Java projects and emphasizes fast responses, secure workspace isolation, and customizable quality gates.

How to install

# Clone and install FastApply
git clone https://github.com/your-org/fastapply-mcp.git
cd fastapply-mcp

# Install dependencies with uv (recommended)
uv sync --all-extras
source .venv/bin/activate
uv pip install -e .

# Or with pip
pip install -e .
cp .env.example .env

# Verify installation completes and environment is prepared
python -m pip install -e .
cp .env.example .env

Configuration and operation notes

# Core FastApply Settings
FAST_APPLY_URL=http://localhost:1234/v1
FAST_APPLY_MODEL=fastapply-1.5b
FAST_APPLY_TIMEOUT=30.0

# Performance Optimization
FAST_APPLY_MAX_TOKENS=8000
FAST_APPLY_TEMPERATURE=0.05

# Security & Isolation
WORKSPACE_ROOT=/path/to/project
FAST_APPLY_STRICT_PATHS=1
MAX_FILE_SIZE=10485760

MCP integration example

{
  "mcpServers": {
    "fastapply_mcp": {
      "command": "uvx",
      "args": ["--from", "/path/to/fastapply-mcp", "run", "python", "main.py"],
      "env": {
        "FAST_APPLY_URL": "http://localhost:1234/v1",
        "FAST_APPLY_MODEL": "fastapply-1.5b",
        "WORKSPACE_ROOT": "/path/to/project"
      }
    }
  }
}

Practical usage patterns

After starting the server, you can leverage the MCP client to perform AI-guided edits, semantic searches, and security analyses across your codebase. Typical workflows include locating references to a symbol, safely refactoring a module with validation, running a comprehensive security scan, and producing a quality gate report that your CI/CD can use to gate deployments.

Security, performance, and scalability notes

FastApply is designed for enterprise use with workspace isolation, strict path checking, and configurable file size limits. It supports caching and parallel processing to deliver sub-second responses for common queries while handling large projects through scalable batch processing.

Troubleshooting tips

If you encounter connection issues, verify the server is running at the configured URL and that the MCP client can reach it. For performance concerns, enable debug logging, monitor resource usage, and consider adjusting the cache or concurrency settings.

Real-world use cases and examples

You can use the server to perform large-scale refactoring, security audits, quality gate automation, architecture analysis, and automated documentation. Examples include finding all references to a legacy class, running a comprehensive security scan with compliance reporting, and generating API documentation from code patterns.

Available tools

edit_file

AI-guided code editing with atomic operations, backup creation, and validation.

dry_run_edit_file

Preview edits safely with diff visualization and validation testing.

read_multiple_files

Batch file reading with concatenated output and contextual analysis.

search_files

Filename pattern search with recursive scanning and exclusion patterns.

search_code_patterns

AST-based semantic search with multi-language support.

analyze_code_structure

Code structure analysis including functions, classes, imports, and complexity.

find_references

Symbol reference tracking and cross-codebase dependency mapping.

dump_syntax_tree

AST visualization with multiple format outputs.

find_code

Direct AST pattern search with CLI integration and JSON output.

find_code_by_rule

YAML rule-based search for advanced pattern matching.

security_scan_comprehensive

Vulnerability scanning with OWASP Top 10 and compliance checks.

quality_assessment_comprehensive

Multi-dimensional code quality analysis including complexity and maintainability.

compliance_reporting_generate

Generate reports for PCI DSS, HIPAA, GDPR, SOC 2, ISO 27001.

quality_gates_evaluate

Quality gate automation with customizable thresholds.

llm_analyze_code

Deep semantic analysis with multi-analysis types and memory features.

llm_generate_rule

Dynamic rule generation from natural language to AST rules.

llm_search_pattern

Intelligent pattern search with context awareness.

auto_ast_intelligence

Auto-intent detection and automated tool selection.