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completion-kit

v0.12.0RubyGems· Ruby

CompletionKit is a prompt testing platform that runs as a Rails engine or a standalone app. Run prompts against real datasets, score every output with an LLM judge against criteria you define, track prompt versions, and get AI-generated improvement suggestions grounded in your actual results. Includes a web UI, REST API, and a built-in MCP server with 34 tools.

The verdict
Maintained. Niche but maintained, actively maintained.
Live from the RubyGems registry · derived rules, not AI
How it scores
MaintenanceHealthy
PopularityNiche
SecurityClean
LicenseOther
DepsZero deps
Maintenance
Last published this month.
Popularity
119 downloads / week
Security
No known advisories for this version (OSV).
License
BUSL-1.1
Dependencies
No runtime dependencies
Recent releases
  • 0.12.0this month
  • 0.11.0this month
  • 0.10.0this month
  • 0.9.0this month
  • 0.8.0this month
  • 0.7.0this month
  • 0.6.0this month
  • 0.5.44this month
completion-kit — CompletionKit is a prompt testing platform that runs as a Rails engine or a standalone app. Run prompts against real datasets, score every output with an LLM judge against criteria you define, track prompt versions, and get AI-generated improvement suggestions grounded in your actual results. Includes a web UI, REST API, and a built-in MCP server with 34 tools. (Ruby / RubyGems) · Modules