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User-submitted MCP servers and clients.
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PlugRail Japanese Calendar
plugrail
Japanese holiday and business-day calculations using official Japan Cabinet Office data.
naokazuyokoo
Dayze
gohluke
Pay-per-call people + life-in-days knowledge API for AI agents (x402 on Base)
Threadctx
threadctx-dev
Shared memory MCP server for AI coding agents (Claude Code, Cursor). Free & local by default.
threadctx
Garmin Local MCP
anup-shesh
Local-first Garmin data warehouse with an analysis-grade MCP server. Sync once, analyze forever - even when the API is down.
Anup Sheshadri
Web Validator MCP by DigestSEO
AKzar1el
W3C HTML/CSS Validator and Technical SEO Audit MCP Server. Part of the DigestSEO (https://digestseo.com) suite.
Tommy
Marketplace
reasoning-services
Claude Code plugin for Reasoning∴Services — structured reasoning tools
price-watch
comparedge
MCP server: verified SaaS price-change history, watch-log for AI assistants, data by ComparEdge
KMT Devllm-cost
comparedge
MCP server: token cost math for LLM API calls, 69 models across 17 providers, prices verified by ComparEdge
KMT Dev
Cache Kit
studiomeyer-io
Leak-safe caching for the Model Context Protocol's SEP-2549 cache hints (ttlMs + cacheScope) — set them right server-side, and never serve a private result across users/tenants client-side.
Matthias Meyer - StudioMeyerOtel
studiomeyer-io
W3C Trace Context bridge for the Model Context Protocol — propagate traces through MCP _meta (SEP-414) and emit OpenTelemetry spans so Host → MCP server → tool → downstream shows up as one trace.
Matthias Meyer - StudioMeyer
Gmail MCP Server
ArtyMcLabin
A Model Context Protocol (MCP) server for Gmail integration in Claude Desktop with auto authentication support. This server enables AI assistants to manage Gmail through natural language interactions.
Arty McLabinSpec Migrator 2511
studiomeyer-io
MCP Spec 2025-11-25 migration toolkit: detect, diff, compatibility-matrix, plan, check. Foundation pillar by StudioMeyer (MCP Factory).
Matthias Meyer - StudioMeyerStateless Migrator
studiomeyer-io
MCP Spec 2025-11-25 -> 2026-07-28 RC migrator: scan + diff + patch + verify CLI. 8 detection rules. AST-rewrite via ts-morph. Foundation pillar by StudioMeyer (MCP Factory).
Matthias Meyer - StudioMeyerStdio Shellguard
studiomeyer-io
Defense-in-depth bundle for MCP stdio servers: drop-in guardExec/guardSpawn wrappers, AST audit CLI, reference MCP server. Closes the Ox-Security 200k-server stdio-RCE class (LiteLLM CVE-2025-69256). MIT, TypeScript, Node >= 20.
Matthias Meyer - StudioMeyerRce Guard
studiomeyer-io
Foundation Pillar 9: Layer-3 RCE defense for MCP servers via policy synthesis + behavioral CVE replay + cross-server canary tracking. v0.1 descriptor-only; v0.2 ships native enforcement.
Matthias Meyer - StudioMeyerTenant Context
studiomeyer-io
AsyncLocalStorage tenant + actor context propagation for MCP servers. Zero runtime dependencies, ESM-only, TypeScript.
Matthias Meyer - StudioMeyerTenant Pair
studiomeyer-io
Foundation library + reference MCP server for multi-user tenancy (couples, families, groups). Bi-temporal storage, conflict-resolver interface, SQLite + Postgres adapters, MCP-Spec 2025-06-18.
Matthias Meyer - StudioMeyerHook Conformance
studiomeyer-io
Test-harness CLI that audits any MCP server for Claude Code v2.1.118 mcp_tool lifecycle-hook readiness — idempotency, latency, determinism, side-effects, GDPR-doc. 56/56 tests, MIT, Foundation Build #3 of the StudioMeyer MCP Factory pillar set.
Matthias Meyer - StudioMeyerServer Attestation
studiomeyer-io
Layer-2 supply-chain hardening for MCP servers — Ed25519-signed tool manifests, runtime spawn-attestation, default-deny argument sanitizer. Defends against marketplace-poisoning + CVE-2025-69256 + CVE-2025-61591.
Matthias Meyer - StudioMeyerProtocol Conformance
studiomeyer-io
Conformance test harness for Model Context Protocol servers — JSON-RPC 2.0, OAuth 2.1 PKCE, tool schemas, capabilities, smoke roundtrip, annotation hygiene. Spec versions 2024-11-05, 2025-03-26, 2025-06-18.
Matthias Meyer - StudioMeyerPassport
studiomeyer-io
Publish-readiness validator for the MCP Registry. Checks server.json (schema, reverse-DNS name, packages, transport) + cross-checks version/mcpName with package.json/Cargo.toml/pyproject.toml before mcp-publisher. Single Rust binary, SARIF, GitHub Action.
Matthias Meyer - StudioMeyerCovenant
studiomeyer-io
Contract & breaking-change detector for MCP servers — semver for your interface. Snapshot tools/resources/prompts into a lockfile, diff in CI, fail on breaking changes. Single Rust binary, SARIF, GitHub Action.
Matthias Meyer - StudioMeyerGauntlet
studiomeyer-io
Reliability + security testing for Model Context Protocol servers — mcp-fuzz (schema-aware fuzzer, SARIF) and mcp-storm (load tester, p50/p95/p99, CI gating) on one fast async MCP client core.
Matthias Meyer - StudioMeyerArmor
studiomeyer-io
Drop-in Rust sidecar for MCP servers — scans tool calls for prompt injection, validates Ed25519 manifest signatures, blocks marketplace-poisoning vectors. <5ms p99 overhead. Defense against OX Security MCP advisory (10+ CVEs, April 2026).
Matthias Meyer - StudioMeyerVideo
studiomeyer-io
Cinema-grade video production MCP server — 8 tools for recording, editing, effects, captions, TTS, and smart screenshots. Built on ffmpeg + Playwright.
Matthias Meyer - StudioMeyerLocal Memory
studiomeyer-io
Persistent local memory for Claude, Cursor & Codex. 21 MCP tools, hybrid retrieval (BM25 + vector RRF), bi-temporal queries, contradiction detection. SQLite + Knowledge Graph. No cloud, no API keys. npx @studiomeyer/local-memory-mcp
Matthias Meyer - StudioMeyerPersonal Suite
studiomeyer-io
Local-first personal productivity MCP server for Claude, Cursor, and any MCP client. Email, Calendar, Messaging, Search, Image Generation. BYOK, no cloud, no signup.
Matthias Meyer - StudioMeyerAcademy
studiomeyer-io
MCP server for StudioMeyer Academy — next lesson, quiz, review, certificates, tutor.
Matthias Meyer - StudioMeyerStudiomeyer Crew
studiomeyer-io
Agent Personas for Claude — 10 MCP tools, 8 personas, 3 workflows. Zero API cost. Free tier available.
Matthias Meyer - StudioMeyerStudiomeyer Geo
studiomeyer-io
AI visibility monitoring with 25 MCP tools + 5 expert workflows. Check how 8 LLM platforms (ChatGPT, Gemini, Perplexity, Claude, Grok, DeepSeek, Meta AI, Copilot) see your brand. Free tier: 20 tools without API keys. Pro: history, trends, alerts. Hosted MCP at geo.studiomeyer.io
Matthias Meyer - StudioMeyer