FabTally Guard
MCP server that gives AI agents paid tools to de-risk costly actions: dependency vetting, x402 endpoint verification, JSON repair, and URL reading. Fronts the Guard HTTP API at guard.fabtally.com.
Limited view. Automated analysis covers part of this stack. Findings reflect what we verified. Grades reflect the full trust pyramid: code, verification depth, and reputation. New projects cap at C until adoption is earned.
Limited view: static analysis for JavaScript is partially covered.
How we verified
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⚡ Connect GitHub → continuous verification on every pushwhy connect →Who stands behind it
zvmzaretsky
Source: Glama
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Destructive tools are labelled
1 tool sounds destructive but lacks a destructiveHint annotation: json_repair
Add destructiveHint:true to any tool whose handler calls .delete(), .upsert(), .update(), unlink, rm, DELETE, DROP, REPLACE INTO, or any operation that overwrites existing data.
All four hints declared on every tool
4/4 tools missing one or more hints — deps_check (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); x402_preflight (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); json_repair (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint), +1 more. OpenAI's directory rejects tools where any hint is missing or non-boolean.
For every tool, set all four hints (readOnlyHint, destructiveHint, idempotentHint, openWorldHint) to explicit true/false values that match the handler’s actual behaviour.
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