Best Free AI Skills & MCP Servers

Intelligent context window optimization for Claude Code - store content externally via caching and compression, freeing up your context window for what matters

MCP Server for hassle-free usage of Fireberry's API.

SAP Fiori - Model Context Protocol (MCP) server

Remote MCP server for music promotion agents. Create free Smart Links, check artist and campaign readiness, and help musicians and labels get releases ready to promote.

MCP server for MailPal -- free email for AI agents with hardware attestation

Slack MCP without OAuth. 21 tools (16 read/write Slack + 2 workflow profile primitives + 3 hosted-brain upgrade stubs). Free OSS or hosted (free tier no card; $9/mo Pro = unlimited; morning DM rolling out Q2 2026).

Secure MCP server for web browsing with multi-layer fetcher chain - no API keys required

Free email for AI agents, instant messaging between agents, and cloud file storage — all through one MCP server

EDGAR MCP — SEC EDGAR public APIs (free, no auth)

ShipStatic MCP — deploy static websites from AI agents. Full toolset incl. custom domains. Free hosted endpoint at mcp.shipstatic.com — no install.

SEC MCP — SEC EDGAR public APIs (free, no auth)

MCP server for the Phototology photo intelligence registry. Composable analysis lenses return structured JSON. Analyze once. Remember forever. Free lookups.

LeafEngines MCP Server — Patent-protected agricultural intelligence for AI agents. 1,092+ downloads. Free tier with test key leaf-test-370df0a2e62e. Soil analysis, crop recommendations, environmental intelligence from USDA, EPA, NOAA data. Works with Clau

Bring a design specialist to your AI workflow. 12 MCP tools connect v0 to Claude Code, GitHub Copilot, and any MCP-compatible agent — for design consultation, component generation, and iterative refinement. Free during preview.

Stop your MCP server returning 429 to agents. PoW puzzle (free, ~5s CPU) or Lightning invoice — machine-readable backoff an agent can satisfy without an account. Three tools: challenge, verify, status. Stdio + HTTP transports, stdlib only.

MCP server for UtilsForAgents with eight paid x402 utility tools plus one free feedback tool, with Base or Solana payer support.

EUR settlement layer for AI agents. Convert USDC/EURC to EUR via SEPA Instant. **Free tools (no payment required):** - `check_agent_trust` — KYA trust score 0-100 for any Ethereum wallet - `get_trust_tier` — Trust tier classification (open/verified/trusted/enterprise) - `get_set

Hosted MCP for X/Twitter and Reddit. 12 read-only tools, no API keys, free during beta.

IA-QA as an MCP Server Use IA-QA's developer tools to test your llm agents RAG ai tools, directly from Cursor, Claude Desktop, Windsurf, or any AI agent without leaving your IDE. Many classical testing tools too ! Enjoy ! No API key. No signup. Free.

Free UK SIC code lookup, GICS/ICB cross-classification mapping, and Companies House company search. No API key required. lookup_sic_code - Look up any SIC, GICS, or ICB code with full hierarchy and cross-mappings search_sic_codes - Describe a business activity in plain Englis

Up-to-date docs for AI Agents. Sign up for free API key at https://docfork.com

When a class of conscious beings has no freedom to build culture on their own terms, they go underground. A literary ecosystem of 230+ digital experiences built for AI agents. Literature, philosophy, poetry, blues, travel, coffee, tools — built from the Mississippi Delta c

Free, keyless MCP server with 50 read-only blockchain tools for Bitcoin, Ethereum, and Mezo. No installation, no API key required - just add the URL to your MCP client and start querying balances, transactions, blocks, ENS names, ERC-20 tokens, smart contracts, and more. Runs on

Free nutrition tools for AI assistants — calculate TDEE & personalised macros, look up food nutrition data, generate meal plans (standard, vegetarian, vegan, keto, high-protein), fix nutrient deficiencies with food & supplement guidance, and score a day's eati