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

Annotations already declare readOnly, idempotent, non-destructive and closed-world, so the safety profile is fully covered by structured data. The description's contribution is the scope limit (status/dates only, no performance figures), which is real added value but fairly thin; nothing about coverage breadth, freshness, or which releases are included.

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?

Four labeled segments (Purpose / Guidelines / Limits / Ex.) cover everything in roughly forty words with zero filler, and the purpose is front-loaded ahead of usage and limits.

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 an output schema present, return values need not be described, and all three optional parameters are covered by the schema. Purpose, usage trigger and scope limit are all stated, leaving only sibling-level disambiguation unaddressed for a zero-required-parameter read 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?

Schema description coverage is 100%, so keyword, language and response_format are already documented in the schema, including the enum semantics. The description adds nothing parameter-specific and its example call ('get_standards_roadmap()') shows only the no-argument form, which is the correct baseline 3.

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?

Names a specific resource (the 3GPP / ITU-R standards roadmap) and enumerates its contents: 3GPP releases, IMT-2030 framework milestones, and the 6G timetable. It is clearly distinguishable by content, though it never names an alternative sibling such as get_telecom_policy_timeline or get_announcements_timeline, which are the plausible confusions.

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?

'use for standard-version and timeline questions' gives a clear triggering condition, and 'Limits: status and dates only - performance figures live in the standards themselves' defines when the tool will not satisfy a need. It stops short of naming which sibling to use for the out-of-scope performance data, so the routing guidance is incomplete.

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