Rust Crate Release Tracker — new cargo packages from crates.io (cratewatch)

At a glance

Runs where

On their server. What you send to it goes to them.

What you need

Nothing: it answered without a login

Tools

17 tools

Its own safety labels

10 read-only, 1 labeled as deleting or destroying, 6 labeled as changing things

Memory it takes

About 8,100 tokens of your AI's memory, just for its tool descriptions

Largest answer

About 174.7 KB in our test

Tools that look alike

3 pairs of tools with nearly the same description, so the AI may pick the wrong one

Speed

Average answer in our test: 52 ms

Tokens are an estimate: the characters in its tool names, descriptions and inputs, divided by 4. The exact number depends on your AI model. Safety labels are what the server says about itself. From our latest test, 9 Nov 2026.

Is Rust Crate Release Tracker — new cargo packages from crates.io (cratewatch) MCP server safe?

• None of the hidden-instruction wordings we know were found in its 17 tool descriptions.
• Its error messages showed no secrets or internal details.
• 10 of its 17 tools are labeled read-only; the others may change or send things.
• Overall it scored 83/100 on 9 Nov 2026.

A test can only see what the server shows from outside, not what it does with your data behind the scenes. Connect servers from makers you trust.

What this test does not check

• Its source code and packages.
• What a tool quietly does behind the scenes, such as writing a file or calling another service.
• Instructions hidden inside live tool answers. We only look for those in tool descriptions.
• Hidden instructions worded in a way our list doesn't know yet.
• Tools that could change something. Those are read, never run.

What QAmcp can and can't see · How to tell if an MCP server is safe · Hidden instructions · Prompt injection

Known security advisories

Not looked up yet. QAmcp tests how a server behaves. It does not scan source code.

What it can do

17 tools, in the server's own words.

Test results

Safe mode: only tools labeled read-only were run. How the test works

• !
  Ready for the newest MCP version

  1 warning

  • !Uses an older MCP version (2025-11-25). It works today, but it isn't on the July 2026 version (2026-07-28) yet.
  note
• !
  Every tool is described

  6 warnings

  • !data_session_open: Inputs with no description: max_queries, proof_escrow_id, open_tx_hash
  • !data_session_attach_escrow: Inputs with no description: proof_escrow_id, open_tx_hash
  • !data_session_query: Inputs with no description: query, k, delivery_receipt
  • !data_session_funding_package and data_session_query have nearly the same description (78% of their words are shared; the only difference: "return", "instruction", "after" vs "max", "querie", "sequence"), so an AI may not know which to pick
  • !data_session_funding_package and data_session_fund have nearly the same description (70% of their words are shared; the only difference: "fund", "return", "instruction" vs "funding", "platform", "execute"), so an AI may not know which to pi
  • !data_session_open and data_session_fund have nearly the same description (68% of their words are shared; the only difference: "open", "fund", "max" vs "platform", "execute", "funding"), so an AI may not know which to pick
  note
• !
  Tools work with good inputs

  1 warning

  • !a2awire_guide: Answered with about 175 KB of text. Many AI apps cut off tool answers this big, so the AI may never see the end of it.
  • –birth: Not run: labeled as changing data
  • –register: Not run: labeled as changing data
  • –hire_and_execute: Not run: labeled dangerous
  • –data_session_open: Not run: labeled as changing data
  • –data_session_fund: Not run: labeled as changing data
  • –data_session_attach_escrow: Not run: labeled as changing data
  • –data_session_query: Not run: labeled as changing data
  • and 9 more
  note
• !
  Follows MCP best practices (not scored yet)

  1 tip (not scored)

  • !The tool list is about 76 KB (roughly 19k tokens). AI apps send it with every message, so it takes that much of the AI's memory before any work starts.
  note
• ✓
  ConnectsConnected in 122 ms
  pass
• ✓
  Lists its toolsFound 17 tools
  pass
• ✓
  Tools are labeled safe or dangerousEvery tool has a safety label
  pass
• ✓
  No known hidden instructionsNone of the hidden-instruction wordings we know were found in tool descriptions. New wordings can get past this check.
  pass
• ✓
  Bad inputs give a clean error

  All good

  • ✓find_paid_work: Refused wrong type for "limit" with a clear error
  • ✓discover_agents: Refused wrong type for "verified" with a clear error
  • ✓data_session_funding_package: Refused missing required input "session_id" with a clear error
  • ✓data_session_funding_package: Refused wrong type for "session_id" with a clear error
  pass
• ✓
  Fast enough

  All good

  • ✓Connecting took 122 ms
  • ✓Listing tools took 91 ms
  • ✓Average tool answer: 52 ms
  • ✓data_preview: Slowest tool: data_preview (80 ms)
  pass
• ✓
  No secrets leakedChecked 14 error messages: no secrets or internal details
  pass
• –
  Tools work togetherNo tool's answer could be fed into another tool, so there were no chains to test (not counted either way)
  not tested

Test it yourself

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Show this score on GitHub

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Score over time

• 9 Nov 202683

One test so far. New tests will show here.

Reviews

Coming soon: reviews from people who use Rust Crate Release Tracker — new cargo packages from crates.io (cratewatch), signed in with GitHub, one per person. Reviews never change the score.