add_watcher

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

With no annotations, the description carries the full behavioral burden for a mutation tool. It does not say whether adding an existing watcher is idempotent or errors, what permissions are required, or whether notifications are triggered — all material for a write operation.

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 front-loaded sentence with zero filler. It is appropriately terse for a simple two-parameter tool, though there was room to fold in one clause of behavioral context at little cost.

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?

The tool is simple, fully required parameters are documented in the schema, and no output schema exists, so little is strictly missing. However, for a mutation with no annotations, the absence of permission/idempotency guidance leaves the definition only minimally viable.

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 100%: both username and ticket_id already carry descriptions, including the format example 'GEM-234'. The description adds no syntax or format detail beyond the schema, so the baseline of 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 (Add) and resource (a user as watcher of a Jira ticket), so the action is unambiguous. It does not explicitly name or contrast with its natural sibling remove_watcher, but the verb+object pairing makes the direction of the operation obvious.

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 description gives no context on when to use this versus remove_watcher or any other tool, and it omits prerequisites such as whether the caller needs permission to modify watchers or whether the user must already exist in Jira. Usage must be entirely inferred.

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