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

Annotations already declare readOnlyHint, idempotentHint, non-destructive and closed-world, so the safety profile is covered. The description adds genuinely useful behavior beyond that: the data provenance ('state's own published list'), the coverage start ('Reports start October 2026'), and the default period ('Defaults to the month in progress'). It does not say what happens for months before the start date or how long a report takes.

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?

One tight sentence plus two short clauses; the resource and scope are front-loaded and nothing is redundant. The mid-sentence list ('first seen, left and came back') is slightly compressed but still readable, and the start-date and default notes are placed where the agent will look for them.

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?

There is no output schema, yet the description enumerates the report's fields (start/end counts, first seen, departed, returned) and its breakdown dimensions (license type, county, city), so the agent can judge relevance without a schema. Combined with annotations and the time boundary, nothing needed to select or call the tool 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?

Schema coverage is 100%, so the baseline is 3, and format patterns plus the 2026-10 lower bound are already documented. The description earns a bit more by disclosing the default value for month (current month in progress), which the schema does not state, and by clarifying that state refers to a single state's own list.

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?

States a specific verb and resource ('One state's monthly cannabis license report from its own published list') and enumerates the report's contents, so an agent knows exactly what it returns. It does not explicitly distinguish itself from the closest sibling, state_license_counts, which an agent must infer from the endpoint/report framing.

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?

Usage is implied by 'monthly license report' and the default-to-current-month note, but there is no explicit when-to-use or when-not, and no alternative named among check_recall, state_license_counts, lookup_license, etc. The agent is left to infer that this covers aggregate month-over-month churn while lookup_license handles individual records.

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