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

With no annotations supplied, the description carries the full burden and does disclose two non-obvious behaviors: that the tool consumes one conversation against the PickSkill plan and that it reads only portfolios the user has already saved. It stops short of covering price staleness, behavior when a named portfolio is missing, or auth/account requirements.

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 content is front-loaded: the main payload description comes first and the billing note is a short trailing sentence. It is dense and parenthetical-heavy but every clause contributes either scope, return content, or cost 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?

This is a simple read-only tool with two optional parameters and no output schema, so the description's enumeration of returned fields successfully substitutes for missing return documentation. The plan-cost note covers the main hidden behavioral risk; only edge cases like an unknown portfolio name are left unaddressed.

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 both parameters (portfolio, include_signals) are already documented in the schema, including the 'omit to read all portfolios' default. The description only loosely echoes what include_signals controls by listing the price change and indicator signals, adding no format or naming details beyond the schema.

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 names a specific verb and resource (reading your saved PickSkill portfolios at pickskill.ai/portfolios) and enumerates the payload: holdings and weights, latest price change, 8 indicator signals, and bullish/bearish counts per holding. It is clear what the tool returns, though it does not explicitly contrast itself with siblings like get_stock_signals or get_earnings_highlights.

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?

Usage is only implied through phrases like 'for a quick health check' and 'Your saved PickSkill portfolios,' which signals this is a portfolio-level read rather than a single-symbol lookup. There is no explicit when-to-use/when-not guidance or named alternative for users who want per-symbol signals.

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