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

Annotations already declare readOnlyHint, idempotentHint, non-destructive, and openWorld=false; the description adds valuable behavioral detail: it returns rental counts within 1 km, median rent split by bedrooms, sorts busiest first, and includes bkkradar.com page links. It does not discuss rate limits or response shape beyond those content hints, but for an annotated read-only list this is solid.

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 compact sentences, front-loaded with the station/rent resource and no filler. Sorting, filtering, output metrics, and links each earn inclusion.

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?

No output schema exists, so the description must carry return-value context; it identifies the key returned metrics and page links, making the tool callable without additional docs. Currency (e.g., THB) and exact response structure are not specified, leaving a minor completeness gap.

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 lang, line, and limit are already fully documented; the baseline is 3. The description only echoes the line filter and busiest-first ordering, adding little parameter-specific semantics beyond the schema.

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 names the resource precisely (Bangkok BTS/MRT/Airport Link stations), the metrics returned (rentals within 1 km, median rent by bedroom count), ordering (busiest first), and an optional line filter. It does not explicitly route against sibling tools such as area_stats or nearby_condos, so it is clear but lacks sibling differentiation.

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?

It implies the tool is for station-level rent data and notes the optional line filter, but gives no explicit when-to-use guidance, prerequisites, or exclusions versus area_stats, nearby_condos, or search_condos. The usage is inferable from the resource description but not guided.

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