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vaultwarden-mcp

Put cipher

vaultwarden_put_cipher

Update an existing Vaultwarden cipher by ID using JSON, params, or form data to modify stored item details.

Instructions

Update a cipher (PUT alias)

Input Schema

NameRequiredDescriptionDefault
formNo
paramsNo
cipher_idYes
json_bodyNo

Schema Changelog

Changes observed during successful MCP inspections.

  1. Addedv0.2.2

TDQS

C2.6/5.0
Behavior2/5

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

The annotations already declare this as a non-read-only, non-destructive, open-world mutation. The description adds only '(PUT alias),' which does not disclose permissions, side effects, partial-update semantics, or what happens to unspecified cipher fields. With annotations present, the bar is lower, but no meaningful behavioral context is added.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is short and front-loaded with the core action. It contains no wasted words, though its brevity reflects under-specification rather than helpful tightness.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness2/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a mutation tool with 4 parameters, 0% schema description coverage, no output schema, and many similar cipher-update siblings, the description is too sparse. It does not explain the body structure, the difference between this and partial/admin/share cipher updates, or what the return behavior is.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters1/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 0% for 4 parameters, and the description provides no parameter-level detail. The opaque parameters form, params, and json_body are left completely unexplained, and the description does not compensate for the schema gap.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description states a specific verb and resource: 'Update a cipher.' However, it does not distinguish this tool from the many sibling cipher-mutation tools, such as put_cipher_partial, put_cipher_admin, put_cipher_share, ciphers_edit_item, or post_cipher. The parenthetical '(PUT alias)' is ambiguous and does not clarify scope.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

There is no guidance on when to use this tool versus alternatives, no prerequisites, and no exclusions. The description merely identifies the operation without telling an agent how to choose among the numerous cipher-update siblings.

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

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