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

Annotations already declare readOnly, idempotent, non-destructive, so the safety profile is covered. The description adds the non-obvious behavioral limit that saved searches are inert data rather than executable queries, plus how the returned ID is consumed downstream. It stops short of describing pagination or the exact shape of each returned record.

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 short sentences, front-loaded with purpose, then definition, then the actionable constraint. No filler and nothing repeated from the annotations or schema.

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 carries some of the return-value burden and does so partially by referencing 'returned filter criteria' and 'numeric ID'. What it omits is the full set of returned fields (e.g. name, id, filter contents), which an agent planning the follow-up list_transactions call would benefit from.

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?

Only one parameter (user_id) with 100% schema description coverage, so the schema already carries the semantics. The description adds no per-parameter detail such as whose user_id is expected or whether it defaults to the current user, which would be the only way to exceed the baseline here.

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 ('Lists saved searches belonging to a user') and immediately defines the domain term ('pre-configured transaction filters'), which separates it from list_transactions and the other list_* siblings. An agent knows exactly what this returns without opening the schema.

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?

Explicitly states the key constraint ('cannot be executed via the API') and names two concrete alternatives with their conditions: pass the filter criteria to list_transactions manually, or open in the app via navigate_to_transactions with the numeric ID. This is textbook when/when-not routing.

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