MCP Servers

📟 - Page-cited retrieval of embedded/firmware reference docs (datasheets, MCU registers, Modbus/CAN, SCPI, IEEE 1547/SunSpec) for coding agents — returns verbatim source snippets with page citations, or "no confident match" instead of a fabricated value. No signup or API key.

Build any Telink/embedded SDK (Eclipse headless / Make / generic) via natural language. Auto-detects build pattern and exposes buildinfo/buildrun/buildlist MCP tools. Cross-platform.

Generate diagrams from structured JSON across 18 types (architecture, ERD, sequence, flowchart, Gantt…) — native SVG/PNG, no headless browser. Built for LLMs and agents.

Zero-dependency chart server that renders bar, line, pie, scatter, and more from JSON or CSV to SVG, HTML, PNG, or data URL. Built-in themes; PNG output renders inline in chat. Install via uvx --from charted[mcp] charted-mcp.

Word-sized charts (sparklines, bars, bullets — 106 types) rendered to self-contained SVG with generated alt text. Three tools: find the right chart for a question, get its wiring, render it. Works in chat surfaces that can't run React. Install via npx -y @microcharts/mcp.

Unit conversion and dimensional analysis backed by the bundled GNU units database (3000+ units, compound expressions, reduction to SI base units). Offline and deterministic. uvx mcp-gnu-units.

Compares approximate filter data structures (Bloom, Counting Bloom, Cuckoo, SuRF) via MCP

Probes your live API and classifies why each endpoint failed (root cause + evidence + calibrated confidence) over MCP, so your AI assistant debugs from evidence instead of guessing. Deterministic rules, no black box. Works with FastAPI, Express, Next.js, tRPC, and GraphQL. npm i -g qa-probe

Lets the non-technical people you build for request UI changes directly on your live site, then pulls each request (with the exact element and page) into your coding agent so it builds it on a branch and opens a pull request. Works with Claude Code, Cursor, Cline, Codex, and remote agents over HTTP. npx -y amendor-mcp

Gives any AI assistant real architectural understanding of a codebase: tech-stack overview, internal dependency graph with cycle detection, risk hotspots, and module summaries. Local, zero-config, no API keys. uvx mcp-architect.

Order groceries from Yandex Lavka (Russia): search the catalog, build a cart, and place an order with a two-step confirmation before any charge. Unofficial (reverse-engineered private web API); local stdio or remote HTTP with OAuth. uvx yandex-lavka-mcp.

Compare parcel and letter delivery prices across 60+ carriers in 27 European countries. Remote MCP: packzoo.com/api/mcp.

🎖️ - Deterministic axe-core accessibility scanning (WCAG 2.1 AA, EN 301 549, PDF/UA) through a wcagc account: scan any public URL or PDF, crawl a whole registered site, replay saved multi-step journeys, and read violation trends. Returns structured findings — rule, severity counts and the success criteria involved — so the assistant reasons over real results rather than guessing from markup. Every scan result carries an automated-coverage disclaimer instead of a score or a pass/fail verdict. Ho

Search @imqueue docs and scaffold typed services & clients for AI coding agents, access CLI and manage your service fleet.

Keyless local MCP server bringing ISTQB / OWASP / IEEE / ISO / EU AI Act QA standards into your AI client: standards-grounded retrieval, deterministic QA effort estimation, and automated QA document quality review (0-100 rubric) plus JUnit/CSV test-results flakiness analysis. uvx qai-consultant-mcp

Affected-test selection for Kotlin/Android projects: returns only the unit tests impacted by the current working-tree changes, so agents skip full test runs while iterating. Function-level static analysis via Kotlin Analysis API — call graph over functions, properties (initializers, delegates, accessors), constructors and callable references — with automatic multi-module and Android variant source-set discovery. Verified on Now in Android (34 modules, ~4s per query). brew install mikhailhal/tap/

🎖️ - Reliable async execution for agent tool calls: schema-gate hallucinated payloads before they run, absorb rate limits and outages with retries/backoff/circuit breakers, idempotency keys, human approval gates, encrypted credentials, replay, and signed-webhook results. Errors come back with an llmhint the agent can self-correct from. Hosted remote (api.klanexai.com/mcp, free sandbox) or npx -y klanex-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

Operator leaderboard measuring users, not models — ranks AI coding operators by token cascade efficiency (Yield = Cache Reads × Output / Input²). 15 MCP tools: rank, pull, submit (ed25519-signed), diagnose, simulate. Privacy-first: only token counts leave the machine. npx sigrank

CI for ink interactive-fiction stories. Compiles, exhaustively playtests every branch, and finds runtime errors (with a repro path), unreachable knots, and every distinct ending — so an agent can verify the story it wrote. Writes no prose. claude mcp add inkcheck -- npx -y inkcheck mcp

Render and verify native Rust GUIs with no display or GPU: render to a typed accessibility tree, query/interact by semantic selector (never coordinates), check contrast/focus-order/hit-target-size, diff screenshots, and watch motion play as a captioned filmstrip. 13 tools. cargo install fenestra-mcp.

Webhook & callback layer for AI agents: create a callback URL, then waitforcallback to block until the webhook lands — signature-verified and decrypted — instead of polling. Verify HMAC, list/replay callbacks. npx -y @hooksense/mcp

Audits a domain email deliverability: SPF, DKIM, DMARC, MX, mail provider, DNS blacklist, catch-all, and domain age, returning a 0-100 health score via an Apify actor.

Shorten links, read click analytics, generate branded QR codes, and manage links on opn.onl — the open-source, self-hostable URL shortener. Works with the hosted service or your own instance.