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

Annotations already declare readOnlyHint=true, destructiveHint=false, and openWorldHint=false, so safety is covered. The description adds one useful behavioral fact — that results are enriched with live market data across all symbols — but says nothing about freshness, latency, or what happens when a watchlist_id is invalid.

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 short sentences, correctly front-loaded with the core action before the value framing. 'At a glance' is mild marketing padding but not enough to hurt usability.

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-parameter read tool with full annotation coverage and 100% schema coverage, this is close to complete: the agent knows what it fetches and that market data comes along. Only return shape (no output schema) and error/empty-watchlist behavior are left unstated.

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 the single parameter documented as 'ID of watchlist to fetch', so the schema carries the load. The description adds only the implication that all symbols in that watchlist are returned; it provides no format or lookup guidance. Baseline 3 applies.

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 ('Get watchlist') and adds scope that matters: it returns current market data for all symbols, not just the watchlist definition. This distinguishes it from update/create/delete_watchlist, though it doesn't distinguish it from data-returning siblings like get_market_snapshot.

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?

'See your tracked assets at a glance' implies the read/inspection use case but never states when to prefer this over get_market_snapshot or other market-data siblings. No prerequisites or exclusions are given, so the agent must infer selection.

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