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

Annotations already declare destructiveHint=true and readOnlyHint=false, so the safety profile is known; the description adds real value beyond that by scoping the blast radius ('only removes the watch entry: it never touches a holding') and mandating user confirmation. It does not describe the response or failure modes, but annotations carry most of that burden.

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?

Front-loaded with the action and its scope, then a second paragraph on addressing. Every sentence earns its place, though the addressing paragraph is somewhat dense and could be tightened.

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 destructive mutation with no output schema, it covers what is removed, what is preserved, how to address the instrument, and the confirmation requirement. Adequate to call the tool correctly, with only return/confirmation-feedback behavior left implicit.

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 baseline is 3, but the description adds non-trivial addressing semantics: ticker as MIC:TICKER (e.g. XPAR:AIR) versus the OCC symbol in optionContract, framed against how GetMyPortfolio displays them. This clarifies the mutual-exclusion intent behind the two identifier params.

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?

Specific verb (Remove) plus resource (stock or option contract from the USER's portfolio watchlist). It is clearly distinguishable from the inverse sibling WatchInstrument and from GetMyPortfolio, which it references for the addressing convention.

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?

Gives a clear context (removing a watched entry) and a per-call prerequisite ('Confirm with the user before removing'), plus explicit instructions to source the symbol from GetMyPortfolio's Watching section. It stops short of explicitly naming WatchInstrument as the inverse operation to use instead.

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