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

Annotations already declare readOnly, idempotent, non-destructive and closed-world, so safety is covered. The description adds behavior the annotations cannot: newest-first ordering and the shape of each returned item (rule, effective date, source, FxLayer delta), which is the most valuable disclosure given there is no output schema.

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?

A single front-loaded sentence: the subject comes first, the item contents are compactly enumerated, and the ordering hint closes it. No filler or restated title.

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?

With no output schema, the description usefully enumerates the return fields and ordering, and the tool is a simple two-parameter read. It still omits pagination/limit semantics, which is the one gap for correct invocation.

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 only 50% (query documented, limit not), so the description should carry more weight. 'Newest first' weakly implies limit selects the most recent N entries, but neither limit's cap of 50 nor query's matching semantics are clarified 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?

States a specific resource (RBI / FEMA / income-tax / GST changes tracked by FxLayer) and enumerates what each item carries (rule, effective date, source, FxLayer delta), which is clear. It does not explicitly contrast itself with siblings such as about_fxlayer or search, so it stops short of a 5.

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 when-to-use statement, no prerequisites, and no named alternative. An agent must infer that this is the feed for regulatory-change lookups rather than a keyword search like search or a static explainer like about_fxlayer.

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