[ycexiao]

• chore: add clear and informative outputs
• chore: update the MCP tool interface

What problem does this PR address?

Update the error information and MCP tool interface so the agent can get more information.

What should the reviewer(s) do?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.69%. Comparing base (4e25b63) to head (93fcf3c).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #55   +/-   ##
=======================================
  Coverage   99.69%   99.69%           
=======================================
  Files           8        8           
  Lines         648      648           
=======================================
  Hits          646      646           
  Misses          2        2           

Files with missing lines	Coverage Δ
tests/test_refinement_server.py	100.00% <ø> (ø)

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[ycexiao]

@sbillinge, it's ready for review.