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

Annotations already declare readOnlyHint, destructiveHint=false and openWorldHint=false, so the safety profile is covered. The description still adds real value: it discloses the owner-role auth requirement and that revoked grants are returned alongside active ones, which an agent would not know from the annotations alone.

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?

One sentence with no filler, front-loaded with the caller role and the verb. The noun phrase 'registration-bound internal-agent spending grants and their monthly accepted commitments' is dense domain jargon, but each qualifier narrows scope meaningfully.

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?

With zero parameters, full annotation coverage, and an output schema that documents the return shape, the description covers what remains: caller role, scope of grants returned, and included commitment data. Only the relationship to the budget sibling is left unclear.

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 4 applies.

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 ('read') and a precisely scoped resource ('active and revoked registration-bound internal-agent spending grants and their monthly accepted commitments'). The read-only framing implicitly separates it from siblings private_agent_delegation_set and private_agent_delegation_revoke, but it never names them or distinguishes itself from private_agent_budget, so differentiation is inferred rather than stated.

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?

'As the account owner' supplies a useful access precondition, which is a form of usage guidance. However, there is no explicit statement of when to call this versus private_agent_budget or account_usage, and no exclusions or alternatives are offered.

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