nexus_market_quote

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

Discloses caching behavior (15 min) and data source (Alpha Vantage), which provides useful context. However, without annotations, it lacks details on authentication, rate limits, or side effects for a read-only operation.

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?

Extremely concise with two sentences. The first sentence clearly states the action, and the second adds relevant behavioral info. No unnecessary words.

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?

Missing output details. The description says 'market quote' but does not specify return fields (price, volume, time, etc.). With no output schema, the description should provide at least an overview of results, which it does not.

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 100% with descriptions for both parameters. The description's mention of asset types adds context but does not significantly augment the schema. Baseline score of 3 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?

Description clearly states the tool retrieves a real-time market quote for equities, FX pairs, or commodities, which is specific and aligns with the tool name. It does not explicitly differentiate from sibling 'nexus_bulk_quotes', but the scope is clear.

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?

No guidance on when to use this tool versus alternatives like nexus_bulk_quotes or nexus_analyze. The description does not mention prerequisites, limitations, or exclusions.

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