list_announcements

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

The description adds context beyond the readOnlyHint annotation by clarifying that the tool returns only announcements and excludes ordinary discussion topics. It does not contradict the annotation, and for a simple list operation, it provides sufficient behavioral transparency.

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, precise sentences deliver all necessary information with zero waste. It is front-loaded with the action and scope, making it easy to scan.

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 one simple parameter, a clear return scope, and an explicit alternative, the description is fully sufficient for an agent to use the tool correctly without any output schema. No critical information is missing.

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 only parameter, 'course_identifier', is fully described in the input schema (100% coverage) as 'Course code or Canvas ID'. The description does not add extra meaning, so it meets the baseline of 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?

The description clearly states the verb ('List') and resource ('a course's announcements'), and explicitly limits the scope with 'and nothing else.' It also distinguishes itself from the sibling tool 'list_discussion_topics' by noting that ordinary discussion topics are excluded, making the purpose unambiguous.

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 description explicitly states when to use this tool ('Returns announcements only') and provides a direct alternative: 'Use list_discussion_topics for discussions.' This gives the agent clear guidance on tool selection.

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