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

Annotations only declare a safe read (readOnlyHint=true, destructiveHint=false, openWorldHint=false), which would mislead an agent into thinking this is a functioning read. The description adds the crucial behavioral fact that the tool no longer exists. It does not say whether a call errors or returns empty, so it stops short of full transparency.

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?

A single sentence, front-loaded with the decisive 'Removed:' marker so the agent gets the critical fact first. No filler.

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 zero-parameter, no-output tool this covers everything an agent needs: it is gone and where the setting now lives. The only gap is the runtime behavior of an actual call and whether the related set_watch_defaults sibling is similarly affected.

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?

The tool takes zero parameters, so there is nothing to disambiguate and the baseline of 4 applies. The description correctly makes no attempt to describe inputs.

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 states a specific, actionable fact about the tool: it has been removed and watch defaults are now an account setting. That is clear and prevents a wasted call, though it never says what the tool originally did and does not differentiate this stub from the still-listed sibling set_watch_defaults.

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?

It gives an explicit when-not (the tool is removed) and an explicit alternative destination ('Change them in the Ticker web app under Settings'), leaving nothing for the agent to infer about where to go instead.

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