Link Project to Vault

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

Annotations already indicate idempotent (true) and non-destructive (false destructiveness), so the bar is lower. The description adds valuable behavioral context: it explains the association is organizational metadata and emphasizes the multiplicity of projects per vault. It does not conflict with annotations and gives a clear semantic model.

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 three sentences, front-loaded with the core action, and every sentence earns its place. The first sentence states the function, the second explains the metadata purpose, and the third clarifies multiplicity. No fluff or repetition.

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 and has an output schema, so return values don't need explanation. Annotations cover idempotency and safety. However, the description leaves parameter semantics under-specified, which could lead to incorrect invocation (e.g., what 'vault' value to use). The metadata context and multiplicity note provide some completeness, but the param gap prevents a higher score.

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%, so the description must compensate. It only restates the parameter names ('vault', 'Project name') without explaining value format, examples, or constraints. There is no guidance on how to specify a vault (ID, name?) or what constitutes a valid project_name. The description adds virtually no semantic value beyond the 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 clearly states the tool's purpose: 'Associate a Claude Project name with a vault.' It also distinguishes itself from sibling tools by emphasizing this is organizational metadata linking a project to a vault, not a document or session link. The term 'metadata' and the multiplicity note ('a vault can be linked to multiple projects') further clarify its unique role.

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 provides clear context for when to use the tool: it records which Claude Projects use knowledge from a vault. However, it does not explicitly mention alternatives or exclusions, such as pointing out that document links should use vault_link_doc. The guidance is implied but not fully explicit.

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