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

Annotations already declare readOnlyHint=true, idempotentHint=true, and openWorldHint=false, so the safety and repeatability profile is covered. The description adds useful return-content context (what data comes back), but says nothing about data freshness, error behavior for unknown IDs, or rate limits, so it is only a modest addition.

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 front-loaded sentence with a colon-delimited payload list; nothing is redundant or padded. Slightly jargon-y terms ('best window', 'neighbor reports') are the only minor cost.

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 one-parameter read-only tool with no output schema, the description does the important remaining work of summarizing what is returned, which the schema cannot. The gaps are the absence of sibling routing guidance and any note on failure modes for a bad venue_id.

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?

There is a single parameter at 100% schema description coverage, and the schema already explains that venue_id comes from find_parking. The description's 'one Easy Lane venue' reinforces that a single identifier is expected but adds no format or example detail beyond the schema, so 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?

States a specific verb+resource (full parking detail for one 'Easy Lane' venue) and enumerates the payload contents (lot info, best window, metered blocks, neighbor reports). It is clear what the tool returns, but it never names or contrasts itself with siblings such as check_parking, airport_parking, or find_parking, so an agent must 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?

No when-to-use or when-not-to-use guidance appears in the description. The single-venue scope implies a lookup-after-discovery flow, but the explicit routing hint ('venue_id returned by find_parking') lives only in the schema, not the description, so nothing steers the agent between this and its seven siblings.

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