"Understanding Code Execution in Programming" matching MCP connectors:

AppDeploy turns app ideas described in AI chat into live full-stack web applications

Free platform to test MCP clients without installing anything. Create mock tools with dynamic templates, configurable delays, conditions (if/then), and response sequences. Supports JSON-RPC 2.0 over Streamable HTTP. Built-in text_echo and json_echo tools. Rate-limited tiers: anonymous (5 calls/min, 1 mock tool), registered (10 calls/min, 4 mock tools), premium (60 calls/min, unlimited). Zero setup — no install, no registration required. More info: https://www.testmcp.dev

AI infrastructure design agent. Describe your app in plain English; Riley designs, prices, and deploys AWS or GCP infrastructure with generated Terraform.

MCP server for German & EU law. Verified, citable legal context for any LLM. Daily updates from official sources, hosted in Germany

Universal pay-per-call tool API for AI agents. Web search, price feeds, hive memory, LLM routing, code sandbox. Free tier (10 calls/day, no signup). x402 payments on Base + Solana.

Your app's translations in Tolgee: search keys, create translations, trigger machine translation

Official Microsoft Learn MCP Server – real-time, trusted docs & code samples for AI and LLMs.

Point-in-time, survivorship-free SEC EDGAR fundamentals + smart-money signals for AI agents.

X-Z-CS AI validation with auditable reasoning. 8 active tools; 5 in maintenance. v0.5.59

Offline US medical code lookup and crosswalk — ICD-10-CM/PCS, HCPCS Level II, RxNorm. Keyless.

Agentic code review, no signup to try: reality gates + frontier-model review, with veto.

Ground-truth code graph for your codebase: exact callers, callees, symbols & dependencies.

AI agents find, message & book SMBs; pay per call in USDC on Base via x402. 14 tools, compliant.

Point-in-time access to Luxembourg law and ten EU acts: what any law said on a given date, not just the current text. 1,409 consolidated works and 4,705 dated versions from the official Legilux and EUR-Lex sources. Ten read-only tools: as-of text, timelines, per-article history, diffs between dates, and hash-verifiable provenance. No key.

Read-only access to NewTqnia news, terminology, and explainers in English and Arabic.

Look up US healthcare providers in the NPPES NPI registry and resolve NUCC specialty codes.

Upload, edit, compress, protect, redact, and compare PDFs with KDAN PDF in Claude and ChatGPT.

Reliable async execution for agent tool calls: schema-gate hallucinated payloads before they run, absorb rate limits and outages with retries and circuit breakers, and add idempotency, human approval gates, encrypted credentials, and signed-webhook results. Failed calls return an llm_hint the agent can self-correct from.

Reliable async execution for agent tool calls: schema gating, retries, idempotency, audit trail.

Korean equities in English: DART filings, activist & foreign-holder classification, KRX news.