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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=true, so the safety profile is covered by structured data. The description adds one genuinely useful behavioral fact — that the response includes ALL fields, so no follow-up call is needed for a complete record — but says nothing about auth requirements, error behavior for unknown ids, or how it differs from a filtered read.

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, and the most decision-relevant fact ('ALL its fields') is front-loaded. The trailing 'GET /api/groups/{id}' is mild redundancy against the tool name, though it does help an agent map the tool to the underlying API surface.

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 single-parameter read with annotation coverage and no output schema, the description supplies what an agent actually needs: that it returns a complete record for one id. No output schema exists, so the 'ALL its fields' note does the job that a return-value description would otherwise do.

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% and the single parameter carries its own description ('Schedule It group id'), so the baseline is 3. The description's 'by id' restates the obvious and adds no format, range, or sourcing guidance (e.g. how to obtain a valid group_id) beyond the schema.

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 and resource ('Get group' implied by 'One resource group by id') plus scope: a single group, not a collection, with 'ALL its fields'. This contrasts implicitly with the list_groups sibling. It stops short of naming the alternative tool outright, so it lands just below top marks.

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?

Usage is only implied: an agent can infer it should call this when it has a group id and needs the complete record rather than a list. There is no explicit when-to-use statement, no exclusion (e.g. 'use list_groups to find ids first'), and no note about behavior on a nonexistent id.

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