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

Annotations already declare readOnlyHint=true and openWorldHint=false, so safety is covered; the description adds genuinely useful context beyond that by noting each valuation figure carries its recording date and the runway/burn carries an as-of date, warning the agent that values may be stale. It says nothing about behavior for tickers lacking fundamentals (nulls vs. errors), which keeps it below a 5.

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?

A single sentence that front-loads the resource and then lists the concrete payload fields. No filler, no restatement of the title, every clause carries information.

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?

An output schema exists and annotations cover safety, so the description need only frame scope and content, which it does by naming the returned data categories. What remains unstated is the relationship to the dilution/snapshot siblings and how partial data is represented.

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 (ticker) at 100% schema description coverage, including a format example, so the schema carries the burden and baseline is 4. The description adds no ticker-specific nuance (exchange prefixes, case sensitivity) beyond what the schema states.

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+resource (retrieve latest fundamentals for a ticker) and enumerates the exact data returned: float, market cap, shares outstanding, latest split, and cash runway/burn. It does not distinguish itself from overlapping siblings such as snacs_dilution_get, snacs_dilution_asof_get, or snacs_snapshot_get, so an agent must infer the boundary.

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 word "Latest" implies a current-state scope as opposed to point-in-time lookups (contrast snacs_dilution_asof_get), but this is never made explicit. No alternative tool is named and no when-not-to-use condition is given, leaving the choice among the many fundamental-ish siblings to inference.

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