Sign a pack with Vault Transit

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

Annotations already indicate openWorldHint=true and destructiveHint=false, and the description adds meaningful context beyond that: it requires a pip extra, makes network calls, POSTs to a specific Vault endpoint, and returns a pack with a vault_signature block. This gives the agent a clear behavioral model without contradicting the annotations.

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 the core purpose, then uses bolded warnings for installation and network surface, then a compact Args list. It is appropriately sized for a tool with four parameters and a network dependency, though the Args section is somewhat redundant with the schema.

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?

Given the output schema exists and annotations cover open-world behavior, the description provides enough extra context: installation requirement, network reach, endpoint, and return shape. It does not deeply discuss authentication edge cases or failure modes, but for this tool's complexity it is sufficiently 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's Args section largely repeats the schema's parameter descriptions without adding new semantics. The endpoint template '/v1/transit/sign/{key_name}' implicitly ties key_name to the API path, but this is minor incremental value.

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 specific verb+resource: 'Sign a pack's canonical bytes with HashiCorp Vault Transit.' It clearly distinguishes this tool from siblings like sign_pack_aws_kms and sign_pack by naming the Vault Transit backend, and it further differentiates by highlighting the network surface.

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 clear context for when to use this tool: when signing with Vault Transit, and it explicitly notes that it 'reaches a Vault server over the network -- unlike the closed-world tools.' It does not explicitly name alternatives or state when not to use it, but the closed-world contrast provides useful selection guidance.

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