Add changelog entry to package

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

Annotations already declare readOnlyHint=false and destructiveHint=false, establishing that this is a non-readonly, non-destructive mutation. The description adds that entries are 'timestamped and categorized,' which is minor additional context. However, it doesn't disclose important side effects such as whether the changelog file is created if missing, whether package_dir must already exist, or how existing entries are affected. The safety profile is clear, but operational behavior remains vague.

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?

The description is front-loaded with a one-sentence purpose statement, then a bulleted list of use cases. The bullet list is somewhat redundant with the opening sentence and could be tightened, but the overall length is modest and the structure aids scanning. It earns a 4 rather than 5 due to the slight redundancy.

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 simple mutation tool with all parameters described in the schema and no output schema, the description covers the essential 'what' and 'why.' The missing detail about file creation or prerequisites is a minor gap, but the tool is straightforward enough that an agent can likely invoke it correctly with the given information. It is not as lean as the get_calls example but is still reasonably complete.

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%, so the baseline is 3. The description mentions 'breaking changes, new features, bug fixes, and general changes,' which loosely maps to the 'type' parameter values (breaking, feature, bugfix, change), but it adds no syntax or format details beyond the schema. The description does not significantly augment the parameter-level information already present in the input schema.

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 opens with a clear action: 'Add a changelog entry to a package.' It specifies the resource (package) and the operation (add changelog), and distinguishes from sibling tools like package_add_operator and package_add_test by focusing on changelog maintenance. The listed use cases (document changes, track breaking changes, etc.) reinforce the purpose.

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 explicitly states 'Use this tool to' and provides a list of valid use cases, giving clear guidance on when to invoke it. It doesn't name alternatives or define when not to use it, but the sibling tool names and the changelog-specific context make the appropriate context obvious. Lacks explicit exclusions but is otherwise solid.

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