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

Annotations already cover the safety profile (readOnlyHint=false, openWorldHint=true, destructiveHint=false), and the description adds real behavioral value: it discloses the side effect (continuous monitoring begins), a validation gate on the domain, and that alternatives are returned instead of failing silently. It stops short of stating how duplicates or quota are handled.

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 tight sentences with the primary action front-loaded, followed by effect and then the exception path. Nothing is redundant with the schema or annotations.

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 no output schema, the description usefully explains the failure return ('alternatives are returned'), and it covers the mutation's ongoing effect. It leaves the success return shape and duplicate-handling behavior unstated, which is a minor but real gap for a write tool.

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 each parameter is already documented, but the description adds workflow meaning to 'force' that the schema does not: it is the retry flag after a dead-domain rejection rather than a general override. That interplay raises it slightly above the baseline.

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 ('Add a competitor to track') and immediately elaborates what tracking means (pricing, hiring, product changes, press). The creation verb cleanly separates it from siblings like list_competitors and get_competitor without needing to name them.

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?

Provides conditional guidance for the failure path ('call again with force=true'), which is useful. However, it never states when to prefer this over alternatives or prerequisites, such as checking list_competitors first to avoid duplicates, so usage is only implied.

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