market_snapshot

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

No annotations are provided, so the description must carry the full burden. It mentions being 'Powered by Yahoo Finance' but does not disclose data freshness, latency, rate limits, or other behavioral traits that affect agent decisions.

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?

The description is concise with one substantive sentence plus a data source note. It could be slightly more structured, but it efficiently conveys the tool's content.

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?

Given no output schema, the description should explain the return format or structure more comprehensively. It lists categories but lacks specifics on which items are included or how data is presented, leaving ambiguity for the agent.

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?

The tool has no parameters and 100% schema coverage. The description adds value by listing the categories of data returned (indices, crypto, FX, ETFs), which is more informative than the empty schema. Baseline 4 for 0 params is appropriate.

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 clearly states it provides a global market overview of major indices, top crypto, FX rates, and key ETFs. It distinguishes itself from more specialized sibling tools like 'coin_analysis' or 'egx_market_overview' by focusing on a broad snapshot.

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 implies use for a quick market check but does not provide explicit guidance on when to use this tool vs alternatives, or when not to use it. Given the many sibling tools, this is a gap.

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