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growthbook/growthbook-mcp (@growthbook/mcp)

growthbook-mcp · v2.0.0 · scanned

What changed in the harness

Selection accuracy 100→98, token cost up 1%, unconfirmed writes 0%→0%.

Category breakdown

Where the score comes from.

Earned points across the four signals Gradable measures. Safety and Legibility are scored out of 30; Economics and Discoverability are scored out of 20.

01Safety

0.0 / 30

0.0 out of 30
02Legibility

29.5 / 30

29.5 out of 30
03Economics

20.0 / 20

20.0 out of 20
04Discoverability

8.6 / 20

8.6 out of 20

Highest-impact fix

Estimated gain +30 points

Add explicit identity and permission preflight tools

Expose machine-readable principal/tenant confirmation and a non-mutating permission check so agents can verify both before destructive actions.

Description evidence

Defects and rewrites.

1 defect found across the exposed tool descriptions. Suggested rewrites make purpose, inputs, boundaries, and returns easier for an agent to understand.

Tool Defect types Suggested rewrite
growthbook_list_skills
no_return_description
List available GrowthBook agent skills and return each skill's name plus a short description of what it does. Use growthbook_read_skill to load the full workflow for a skill before acting; skills encode how to accomplish GrowthBook tasks well, and use growthbook_call_api to execute the REST calls they describe.

Selection evidence

Confusable tool pairs.

1 pair where similar names or overlapping descriptions may send an agent toward the wrong tool.

Tool A Tool B Confidence Why they collide
growthbook_list_skills growthbook_read_skill medium A user asking to 'read' or 'show' a skill (e.g., 'show me the flag-create skill contents') could trigger the wrong member: 'read the skills' is plausibly interpreted as listing skill names rather than loading a specific skill's workflow, and agents may skip the required list-first step when a user names a skill directly. The descriptions distinguish names+descriptions from full content, but the verb overlap ('list' vs 'read'/'show'/'get') makes the choice genuinely ambiguous for vague requests.

Compare the field

One score is useful.
The evidence makes it actionable.

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