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

Annotations already declare readOnlyHint=true and openWorldHint=false, so the safety profile is covered. However, the description adds almost no behavioral detail: it doesn't say whether calling this tool is a no-op, returns an error, or still performs a legacy mutation, nor what the response looks like.

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 with no filler; the deprecation fact is first and the replacement instruction second. Every word earns its place.

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 deprecated tool, the replacement pointer is largely sufficient, and the annotations cover the read-only safety profile. But the missing parameter semantics and lack of an output schema leave an agent uninformed if it ever has to call join_chain directly.

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 description coverage is 0% and the description does not mention id, team_name, or monthly_commit_usd at all. For a tool with three undocumented parameters, the description offers no semantic help.

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 identifies this tool as 'The old v1 join' and the title says 'Join a chain (old name)', so an agent can tell it is a legacy join operation. It also names the replacement 'hold', which distinguishes it from the sibling set. It stops short of explaining what joining actually does, but that is acceptable for a deprecated pointer.

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?

The instruction 'Use hold instead' is an explicit, unambiguous routing directive: for any join-a-chain use case, the agent should call hold rather than this tool. This is stronger than most sibling-differentiation guidance.

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