Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already declare readOnlyHint=true and openWorldHint=true, so safety is covered. The description adds genuinely useful behavior beyond that: it reads a deployed snapshot and returns fetchedAt/ageMinutes, explicitly surfacing data staleness. It omits pagination or limits, but the freshness disclosure is meaningful added context.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

Front-loads the core purpose in the first sentence, then adds freshness behavior and use cases. Every sentence earns its place, though the phrasing around the freshness caveat is slightly verbose.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a parameterless, read-only tool with no output schema, the description is sufficient: it explains scope, the data source, the freshness metadata returned, and intended use cases. An agent has what it needs to call it correctly.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Zero parameters, so there is nothing to document and the baseline is 4. The description adds no parameter semantics, but none are needed for a parameterless tool.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

States a specific verb (Get) and resource (commit history) with scope (across the owner's public repos). This clearly differentiates it from siblings like get_articles or get_profile, though it does not explicitly distinguish itself from nearby tools such as get_timeline.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

Offers two example intents ('what has he been building lately', 'show the hardest bugs he has fixed') that imply usage context, but provides no explicit when-not guidance or named alternatives. The routing between this and overlapping siblings (get_timeline, get_projects) is left to inference.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.