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MCP Server

graphql-dos-shield

io.github.lazymac2x/graphql-dos-shield
Developer Tools Security Public & reachable MCP 2026-07-28

What this MCP does

Analyzes GraphQL query complexity, rewrites overly complex queries, and applies client rate limits.

Capabilities

Tools

3 tools
complexity_meter
Analyze GraphQL query complexity. Returns depth, field count, list multipliers, and a risk level (LOW/MEDIUM/HIGH/CRITICAL). CRITICAL means the query should be rejected.
Input schema 
{'type': 'object', 'required': ['query'], 'properties': {'query': {'type': 'string', 'description': 'GraphQL query string to analyze'}}}
query_rewriter
Text-level rewrite of an overly complex GraphQL query: strips excess nesting depth and truncates too many fields.
Input schema 
{'type': 'object', 'required': ['query'], 'properties': {'query': {'type': 'string', 'description': 'GraphQL query to simplify'}, 'max_depth': {'type': 'integer', 'description': 'Max nesting depth (default: 3)'}, 'max_fields': {'type': 'integer', 'description': 'Max fields (default: 10)'}}}
rate_limiter
Check and enforce rate limiting for a client. In-memory sliding window — state resets on cold start.
Input schema 
{'type': 'object', 'required': ['client_id'], 'properties': {'limit': {'type': 'integer', 'description': 'Max requests per window (default: 100)'}, 'client_id': {'type': 'string', 'description': 'Unique client identifier'}, 'window_ms': {'type': 'integer', 'description': 'Window in ms (default: 60000)'}}}
History

Recent tool changes

Added
query_rewriter
Sept. 17, 2026, 12:43 p.m.
Added
rate_limiter
Sept. 17, 2026, 12:43 p.m.
Added
complexity_meter
Sept. 17, 2026, 12:43 p.m.
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