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

Annotations already cover the safety profile (readOnlyHint=true, idempotentHint=true, destructiveHint=false, openWorldHint=false), so the bar is lower. The description adds one genuine behavioral signal — that this returns an 'opened' launch and includes votes and public comments — but says nothing about lookup failure behavior or access requirements.

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?

It is a single short fragment with zero padding, which is efficient, but it is under-specified rather than front-loaded: the reader gets a field list before learning what the tool does with the identifier.

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?

Complexity is low (one required parameter, read-only, output schema present so return values need no explanation), and annotations carry the safety profile. Still, the definition omits how to identify the launch and the meaning of the 'opened' qualifier, so it is only minimally sufficient.

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 0% and the single required parameter launch_slug is undocumented; the description never mentions it, its format, or where the agent obtains one. With a low-coverage schema the description is expected to compensate for the gap, and it does not.

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 fragment 'A launch that has opened: pitch, what is new, maker listing, votes and public comments' conveys the resource and the record's contents, but it lacks a verb and never states that it retrieves a single launch by identifier. It only implicitly distinguishes itself from the sibling search_gtm_launches (single record vs. search), leaving the agent to infer the distinction.

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?

There is no when-to-use guidance at all: no mention of search_gtm_launches as the alternative when the slug is unknown, and no prerequisites such as holding a valid launch_slug. The word 'opened' hints at a state constraint but never explains it or says what happens for unopened/upcoming launches.

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