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

Annotations already declare this is a non-read-only, non-destructive, non-idempotent, closed-world write. The description adds real context beyond that: an admin-only authorization requirement, a plan-based quota constraint, and the fact that monitoring begins after adding. It doesn't explain failure modes (e.g., duplicate competitor, non-idempotency consequences), keeping it below 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?

Three short sentences, front-loaded with the core action, then monitoring behavior, then the admin/quota constraints. No wasted words.

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?

With an output schema present, return values need not be described. The description covers the key operational facts an agent needs: auth level, quota check routing, and post-add monitoring. Minor gap in not clarifying duplicate/idempotency behavior, but overall sufficient.

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 with 100% schema description coverage, so the schema fully documents website_url including format. The phrase 'from its website' loosely reinforces the parameter's role but adds no syntax or constraint detail. Baseline 3 applies when the schema does the heavy lifting.

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 (adds) and resource (competitor) with scope (workspace's core watchlist) and source (from its website). This distinguishes it from siblings like add_monitored_page and research_competitor.

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?

Explicitly states 'Admin only' and points to get_plan_and_limits for checking free slots, which is actionable prerequisite guidance. It stops short of stating when not to use it (e.g., vs. research_competitor or add_monitored_page), so not a full 5.

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