Survey finds 6 of 16 popular MCP servers expose no tool definitions
11/12/2026 — 11/12, 14:18·1 sources (all)·1 reports (all)
Key takeaways
- A DEV Community survey picked 16 widely used MCP servers and used a self-built logger, HISTOR, to inspect the tool definitions they expose t…
Background & analysis
At 14:00 on 2026-11-12, the AI channel of DEV Community published an investigation into how accessible tool definitions are across commonly used MCP servers. The author selected 16 MCP servers that a software team might plausibly connect to its agents: the hosted servers of GitHub, Notion, Linear, Atlassian, Sentry and Stripe; Context7, DeepWiki, Hugging Face and Cloudflare's docs server for reading; Firecrawl, Brave Search and Tavily for web retrieval; and three local packages, Playwright, MongoDB and Sentry. To check the situation, the author queried HISTOR, a public log of MCP tool definitions that the author runs, covering tool definitions exposed by these servers to agents over the past 30 days.
The results show that out of the 16 servers, 6 never had their tool definitions read, and the reasons differed by server. GitHub, Notion, Atlassian and Stripe returned HTTP 401 to unauthenticated clients, while Linear and Sentry began blocking scraping on 11-02. The author also noted that another server changed its tool definitions 19 times within a single month. The author explicitly stated that the selection is a self-picked sample, not a customer's setup and not a formal survey. As of the publication, the investigation stops at these findings, with no broader conclusions drawn about the MCP ecosystem.
AI-generated from 1 reports · updated 1 day ago
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Reports on this story headlines open the original
A DEV Community study picked 16 MCP servers a software team might connect to its agents and checked, via its own log HISTOR, what each exposed over the past 30 days. Six yielded nothing: GitHub, Notion, Atlassian and Stripe returned HTTP 401 to unauthenticated clients, and Linear and Sentry began blocking crawlers on November 2. One of the others changed its tool definitions 19 times in a month; the authors note this is a hand-picked sample, not a survey.
DEV Community · AIAI score 53
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