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

Annotations already declare readOnlyHint=true, openWorldHint=true and destructiveHint=false, so the safety profile is covered. The description adds that results include display name and category, but says nothing about result volume/pagination or whether the returned identifier is what other tools accept; with annotations in place, this is adequate rather than rich.

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 sentences, zero waste: the core behavior and return fields come first, the domain nuance about futures second. Nothing is repeated from the title or schema verbatim beyond the enum needed for context.

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 a single optional parameter with no output schema, the description usefully names the returned fields and clarifies the trickiest category value. The one remaining gap is that it does not say whether the returned symbol identifier is the value other tools expect, which an agent would likely still have to discover.

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%, so the enum list is already documented, giving a baseline of 3. The description earns a bump by explaining what 'futures' actually means (CFDs tracking CME/Eurex contracts such as NQ, ES, CL, GC), a domain clarification the schema does not provide.

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 available symbols) and names exactly what is returned: display name and category. None of the sibling tools (get_quote, get_ohlc, draw_chart) overlap with this discovery function, so the role is unambiguous.

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 'optionally filtered by category' clause implies when the parameter is useful, but there is no explicit statement of when to call this versus the data-retrieval siblings (e.g. 'call this first to find valid symbol IDs for get_quote/get_ohlc'). Usage must be inferred from the resource name.

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