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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint=false, so the safety profile is covered. The description adds genuinely useful semantics the annotations cannot: null fields mean no override and the pool's value applies, which shapes how the agent reads the result.

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 sentences, no filler, with the core purpose front-loaded and the override semantics placed second where it belongs. Every clause carries information.

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?

There is no output schema, so the description must carry return-shape burden; it does explain that the grant supplies defaults and limits and that nulls mean no override, which is the key interpretive fact. It stops short of enumerating the response fields, a minor gap for a read tool whose annotations already cover safety.

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?

Schema description coverage is 100% with all three IDs (org_/proj_/pmpg_) documented including patterns, so the schema does the heavy lifting. The description clarifies the relationship between project, pool and grant conceptually but adds no per-parameter detail beyond what the schema provides, so the baseline 3 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 ('Returns') and resource ('one project's grant for a machine pool'), and the word 'one' plus the singular key set distinguishes it from grant_pools_list and grant_pools_edit without opening either schema. It also conveys the semantic layer of the resource (defaults/limits on top of the pool's own).

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?

The singular, ID-keyed retrieval implies usage for fetching a single known grant, which is adequate for a simple getter. However, it never explicitly says when to use this versus grant_pools_list, nor mentions prerequisites such as the caller already needing the pmpg_ ID.

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