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

Annotations already cover safety (readOnly, idempotent, non-destructive, closed-world). The description adds meaningful behavioral context by explaining what each launch record contains and defining realSlips, otherDateMoves, and caughtUpDateMoves, including the caveat that caught-up changes are never counted as slips. This goes beyond the annotations.

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 front-loaded with purpose and filters, then moves to record fields and slip semantics. Three sentences with little waste, though the final sentence about slip counting is dense and could be trimmed or moved to a data dictionary without losing the core tool description.

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?

For a read-only list tool with full annotations but no output schema, the description adequately covers return fields (NET date and precision, status, date changes, page URL) and data semantics. It does not mention pagination, ordering, or the relationship between the 50-item manifest and the limit parameter, but these are minor gaps for a simple list endpoint.

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 the schema already documents all six parameters in detail. The description names four filter dimensions (provider, rocket, launch site, country) but does not add syntax, format, or behavior beyond what the schema provides; limit and include_recent_outcomes are not mentioned. Baseline 3 is appropriate.

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 states a specific verb and resource: 'Upcoming orbital launches from the SpaceNexus manifest ... filterable by provider, rocket, launch site and country.' It is clear what the tool returns, though it does not explicitly differentiate itself from sibling tools like launch_slips or launch_ledger_record.

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 explicit when-to-use guidance, no alternatives named, and no conditions for choosing this tool over siblings such as launch_slips or launch_on_time_record. Usage is only implied by the phrase 'Upcoming orbital launches.'

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