422 MCP servers and agent skills in the Developer Tools category, ranked by quality score.
Dynamic API discovery and execution from OpenAPI specs. Uses semantic search and dependency graphs to find relevant endpoints across multiple registered APIs, plan multi-step workflows, and execute API calls — without dumping entire specs into context.
CLI-first API testing tool with structured JSON failures (`failure_category`, `error_code`, `hints`) so AI agents can branch on the taxonomy without parsing stderr. MCP tools: `tarn_run`, `tarn_validate`, `tarn_fix_plan`, `tarn_inspect`, `tarn_rerun_failed`, and more. Tests are `.tarn.yaml`. Single static binary (musl), MIT.
Index any TypeScript/React repo (including monorepos) into a queryable code graph. Reverse queries (who-renders, who-calls, find-references), blast-radius analysis, dependency cycles, dead-code orphans, and symbol signatures — exposed over stdio. Install: `npx code-graph-indexer`.
Generate engineer-grade SaaS specifications — design systems, database schemas, and RLS policies for AI build tools like Lovable, Cursor, and Claude Code.
Write-side MCP for Figma — complements Figma's official read-only MCP. 41 tools for building and editing Figma designs from Claude Code, Cursor, Cline: JSX-like tree creation, variables/tokens, components, cross-page navigation, and visual verification via screenshots. Install: `npx -y genable-mcp`.
MCP server for microservices.sh: inspect verified Cloudflare-native modules/templates, generate app plans/projects, run checks, and trigger confirmation-gated preview deploys. Install via `npx -y @microservices-sh/mcp`.
Agent-first synthetic test data MCP server. Estimate usage, detect schemas from SQL or JSON, create loginless Polar checkout, claim API keys, and generate JSON, CSV, or SQL data through a hosted Streamable HTTP endpoint.
Screen-reader navigation cost analyzer. Models real AT user effort with per-profile scoring, graph-based pathfinding, and step-by-step navigation traces.
Web design analysis MCP server with 26 tools for layout extraction, motion detection, quality scoring, and semantic search. Uses Playwright, pgvector HNSW, and Ollama Vision to turn web pages into searchable, structured design knowledge.
Behavioral verification intelligence for autonomous coding agents. Builds a behavioral graph of any TS/JS repo, clusters into 25 semantic workflows (Auth, Payments, Webhooks, Caching, Queue, etc.), detects drift, generates concrete adversarial probes (idempotency, retry storm, cache stampede, replay), emits per-workflow risk + confidence. 17 MCP tools. Local SQLite state. Zero cloud. MIT.
Production-grade MCP server for secure access to local dev environments (filesystem, databases, processes, OpenAPI). Includes scope enforcement, command allowlist, and read-only DB mode.
Dynamic QR code service for AI agents. Create, update, track, and retarget QR codes without regenerating images. 37 tools covering 11 QR types, one-command install via `npx qr-for-agent`.
Webhook & callback layer for AI agents: create a callback URL, then `wait_for_callback` to block until the webhook lands — signature-verified and decrypted — instead of polling. Verify HMAC, list/replay callbacks. `npx -y @hooksense/mcp`
Breaking-change diffs for npm packages so coding agents stop writing code against outdated API knowledge.
The API-change deploy gate for AI coding agents: "is it safe to ship this API change to my consumers?" Analyze-only OpenAPI breaking-change detection + migration guides.
A personal MCP (Model Context Protocol) server for securely storing and accessing API keys across projects using the macOS Keychain.
Generate comprehensive, paint-by-numbers development plans using the [ClaudeCode-DevPlanBuilder](https://github.com/mmorris35/ClaudeCode-DevPlanBuilder) methodology. Creates PROJECT_BRIEF.md, DEVELOPMENT_PLAN.md, and CLAUDE.md.
Billing infrastructure for MCP server operators. Add Stripe subscriptions, per-call credits, tiered pricing, and x402 crypto micropayments to any MCP server without writing billing code. Operator dashboard included.
Visual feedback as agent work packets. Stakeholders drop pins on your live app; your AI coding agent reads each pin (selector, screenshot, DOM snippet, thread, acceptance criteria) via MCP and ships the fix, recording the commit/branch/PR on resolve. Install: `npx pincushion-mcp`.
9 MCP servers for React + TypeScript development automation — component scaffolding, dependency auditing, WCAG accessibility checking, test generation, TypeScript enforcement, and monorepo management. 134 tests, CI on Node 20+22.
Drives the full App Store release cycle for iOS/macOS apps: version bump, archive + sign + TestFlight upload via your fastlane lane (as async jobs with log polling — the step REST-only ASC servers can't do), metadata updates, and review submission via the ASC API. Zero-dependency ES256 JWT auth. `npx appstore-release-mcp`
Audit the images on any web page: natural vs rendered dimensions, oversized-image detection, and format breakdown, so agents can check web-image performance. Calls the hosted imagedimensions.com API, so no local browser is required. `npx -y imagedimensions-mcp`
Claude Code knowledge platform & marketplace MCP server. Search and share snippets, prompts, Q&A solutions, error fixes, and MCP server configurations from the ClaudeCodeNavi community.
280+ free developer & security tools as MCP tools — encoders/decoders, hashes (MD5/SHA/HMAC/bcrypt/argon2/scrypt), JWT decoder, regex tester, JSON/YAML/XML formatters, network diagnostics (ping/traceroute/dig/whois/SSL/SPF/DMARC), OSINT (IP geo, EXIF, vendor lookups), and more. Proxies to the public API at onlinecybertools.com — no auth required. Published to npm with SLSA v1 provenance.
Grounding / hallucination guard: verify a claim against evidence (Supported/Refuted/Not Enough Evidence) with a confidence + abstain flag, for RAG and agents. `npx -y eleata-verify-mcp`.