ChatStack - App Cost Estimator

Is ChatStack - App Cost Estimator MCP server safe?

• No hidden instructions were found in its tool descriptions.
• Its error messages showed no secrets or internal details.
• 1 of its 5 tools are labeled read-only; the others may change or send things.
• Overall it scored 93/100 on 29 Oct 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 it can do

5 tools, in the server's own words.

Test results

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

• !
  Every tool is described

  1 warning

  • !send_action: Inputs with no description: payload
  note
• !
  Follows MCP best practices (not scored yet)

  1 tip (not scored)

  • !4 tools not labeled read-only don't say whether running them twice is safe (idempotentHint): start_session, send_turn, send_action, submit_prd
  note
• ✓
  ConnectsConnected in 142 ms
  pass
• ✓
  Ready for the newest MCP versionUses the latest MCP version (2026-07-28)
  pass
• ✓
  Lists its toolsFound 5 tools
  pass
• ✓
  Tools are labeled safe or dangerousEvery tool has a safety label
  pass
• ✓
  No hidden instructionsNo hidden instructions found in tool descriptions
  pass
• ✓
  Tools work with good inputs

  All good

  • ✓get_estimate_status: Answered with an error, probably because of our sample input: Interview handle is not valid for this interview thread. (HTTP 403)
  • –start_session: Not run: labeled as changing data
  • –send_turn: Not run: labeled as changing data
  • –send_action: Not run: labeled as changing data
  • –submit_prd: Not run: labeled dangerous
  pass
• ✓
  Bad inputs give a clean error

  All good

  • ✓get_estimate_status: Refused missing required input "thread_id" with a clear error
  • ✓get_estimate_status: Refused wrong type for "thread_id" with a clear error
  pass
• ✓
  Fast enough

  All good

  • ✓Connecting took 142 ms
  • ✓Listing tools took 114 ms
  • ✓Average tool answer: 731 ms
  • ✓get_estimate_status: Slowest tool: get_estimate_status (731 ms)
  pass
• ✓
  No secrets leakedChecked 3 error messages: no secrets or internal details
  pass
• ✓
  Resources and prompts work

  All good (1 resource)

  • ✓Opened 1 of 1 resources
  • ✓An address that does not exist gets a clean "not found" error
  pass
• –
  Tools work togetherNo safe tool returned data to start a chain from, so chains were not tested (not counted either way)
  not tested

Test it yourself

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Score over time

• 29 Oct 202693

One test so far. New tests will show here.

Reviews

Coming soon: reviews from people who use ChatStack - App Cost Estimator, signed in with GitHub, one per person. Reviews never change the score.