get_balance

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

Annotations declare readOnlyHint=false and openWorldHint=true, and the description usefully reconciles the non-read-only hint by disclosing that membership queries may initialize first-use entitlements — a side effect beyond what the annotations state. It does not quantify the side effect or describe the response, but this is genuine 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?

Two short sentences, front-loaded with the primary action and followed by the side-effect caveat. No filler sentences and nothing redundant.

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 zero-parameter tool with no output schema, annotations covering the safety profile, and a stated side effect, the description is largely sufficient. The only gap is that 'tp_all' entitlements are left unexplained and the returned shape is not characterized, though no output schema exists to lean on.

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?

The tool takes zero parameters, so there is nothing for the description to disambiguate; baseline for a parameterless tool is 4. Schema coverage is 100% but vacuous here.

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?

The description gives a clear verb+resource ('Get ... account ... entitlements'), so an agent knows this returns entitlement data. However, it never distinguishes this tool from the sibling per-service entitlement tools (get_music_entitlements, get_video_entitlements, get_speech_entitlements), and the term 'tp_all' is opaque jargon that adds no clarity.

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?

There is no explicit when-to-use guidance and no routing between this general balance tool and the service-specific entitlement siblings. The note that queries 'may initialize first-use entitlements' hints at a precondition, but it is stated as a behavioral caveat rather than usage guidance.

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