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

Annotations already declare readOnlyHint, idempotentHint, openWorldHint=false and destructiveHint=false, so the safety profile is covered. The description adds genuinely useful domain context: aggregate dollar amounts, zero PII, and the 40th-percentile-by-bedroom semantics that set Section 8 payment standards. It stops short of disclosing pagination (how limit interacts with total results) or error behavior for short queries.

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?

Three tight clauses, front-loaded with the search action. The 'place_id' and Section 8 clauses earn their place by explaining the follow-up lookup pattern; 'zero PII' is a one-phrase privacy signal. No filler.

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 two-parameter read-only search with a fully documented schema, the description covers purpose, return key, and data semantics, which is most of what an agent needs. What it omits is pagination guidance (how to page past limit=100) and the matching semantics of q, which is why it falls short of 5.

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 both params (q and limit) are already documented in the schema, which sets the baseline at 3. The description adds semantic value by explaining what the returned place_id is used for, but contributes nothing about how q is matched (partial vs exact, fuzzy) or how limit behaves in pagination.

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 a specific verb and resource ('Search HUD Fair Market Rents'), scopes the query surface (area/county/state name), and explains the return value ('place_id (10-digit HUD fips) to pull an area's FY2026 FMRs'). It is clearly distinguishable from generic sibling search tools like 'search' or 'resolve'.

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?

The description clearly implies the use case — look up a place_id for an area via its name so you can retrieve FMRs — but never states when to prefer this over sibling search tools or what to do if you already hold a fips/place_id. No explicit exclusions or named alternatives are given.

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