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

Annotations already declare readOnly, idempotent, closed-world and non-destructive, so the safety profile is covered; 'Read-only, no arguments, no network' largely restates them. The description earns credit by disclosing the actual content of the returned rules (grouping the prior day by theme, deriving today from open merge requests, reporting a blocker from its job log), which the agent cannot learn elsewhere.

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 what is returned, then the workflow guidance, in two tight sentences with no wasted preamble. The 'Read-only, no arguments, no network' clause is partially redundant with the annotations and schema, which keeps it from a 5.

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 no output schema, the description carries the burden of conveying what comes back, and it does so by enumerating the three rule areas the playbook covers. An agent knows what it gets and how to use it; only the exact response format is left unspecified, which is minor for an instruction-fetch tool.

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?

There are zero parameters, so the baseline is 4. The description's 'no arguments' is consistent with the empty input schema and leaves no ambiguity about how to call it.

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+resource (returns note-writing rules) and immediately scopes it as the playbook for transforming get_standup_data output into a standup note. This distinguishes it cleanly from the siblings get_standup_data and post_standup_note without the agent needing to open any schema.

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?

Explicitly says to call it once before writing the first note and that the rules do not change between calls, which tells the agent when to invoke it and when not to repeat it. It does not explicitly name the alternative tools for other workflow steps, so it falls just short of full when/when-not/alternatives coverage.

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