Add bookmark

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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It only says 'Add' to a 'local JSON store', which is a mutation but does not mention potential side effects, such as whether duplicates are allowed, whether the operation fails on invalid URLs, or if any return value is produced. This is minimal for a mutation tool.

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 a single, front-loaded sentence with no redundancy. It efficiently communicates the core action and target. Every word earns its place, and it is neither verbose nor under-specified in terms of conciseness.

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 with only two parameters and no output schema, so the description does not need to explain return values. However, because it lacks behavioral transparency (e.g., idempotency, error handling), it is not fully complete. Given the low complexity, it is adequate but has gaps in side-effect disclosure.

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 restates that the tool takes a 'title' and 'URL', which adds nothing beyond the schema's definitions. It does not clarify URL format constraints or title length beyond what the schema already specifies, so it adds minimal extra meaning.

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 clearly states the verb 'Add' with specific resources ('bookmark', 'title', 'URL') and the destination ('local JSON store'). It is unambiguous and distinct from sibling tools like list_bookmarks and search_bookmarks, which have different verbs and purposes.

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 implies the primary use case: when you need to save a bookmark. However, it does not explicitly distinguish when to use this tool over siblings, nor does it mention any exclusions or conditions. Since the tool name itself is highly indicative, the guidance is adequate but not explicit about alternatives.

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