meetings_get_from_join_url

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

The description adds behavioral context beyond the annotations: it discloses the failure mode ('Fails for meetings the user attended but did not organise, because the underlying Graph filter is organiser-only') and the required permission ('Requires OnlineMeetings.Read'). This is exactly the kind of context that annotations alone do not convey.

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?

The description is three sentences long, front-loaded with the main action, followed by contextual rationale and a caveat. Every sentence serves a purpose, and there is no redundant or filler content.

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?

Given the tool has only one parameter, no output schema, and strong annotations, the description is highly complete: it states what the tool returns, its failure conditions, the permission required, and its role within a larger workflow. Nothing essential is missing for an agent to decide when and how to invoke it.

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 schema covers the single parameter (join_url) with a clear description ('The Teams join URL from the calendar event (onlineMeeting.joinUrl)') and the tool description adds no new parameter-specific information beyond what the schema already states. With 100% schema coverage, the baseline of 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?

The description immediately states a specific verb and resource: 'Resolve a Teams join URL to its online meeting record, returning the online meeting id, subject and start time.' It also distinguishes itself from sibling tools by positioning it as a 'plumbing step' that the transcript and attendance tools rely on, making its unique role clear.

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 provides explicit context on when to use the tool: 'the online meeting id is what the transcript and attendance tools need, and a calendar event only carries the join URL.' It also gives a clear when-not: 'Fails for meetings the user attended but did not organise,' though it does not name an alternative tool for that case.

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