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

No annotations are provided, so the description carries the full burden, and it only discloses the 50-match result cap. It says nothing about pagination or offsets (notable given the hard 50 ceiling), default sort behavior, whether results are ranked or arbitrarily ordered, or empty-result behavior.

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 short sentences with zero filler, and the core capability is front-loaded before the result-count note. It is efficient, though arguably too terse for an 11-parameter tool.

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 an 11-parameter, zero-required search tool with no annotations and no output schema, the description is thin: no result shape beyond a count, no default limit (20) or sort behavior, and no note on how filters combine. Sibling routing to search_by_name and compare_companies is also left implicit.

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 all 11 parameters (enums, limits, units like GBP for asset bounds) are already documented in the schema. The description adds no parameter-level meaning beyond that, so the baseline 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 and resource ("Search UK companies") plus the criteria family ("financial criteria"), which implicitly distinguishes it from the name-based search_by_name sibling. It stops short of naming that sibling or stating scope limits (e.g. UK-only, no name lookup), so it is clear but not fully differentiated.

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 explicit when-to-use or when-not-to-use guidance and no named alternative. "By financial criteria" implies it is the criteria-driven sibling of search_by_name, but the agent must infer that routing rather than being told.

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