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Knuckles-Team

vaultwarden-mcp

Takeover emergency access

vaultwarden_takeover_emergency_access

Initiates an emergency access takeover by retrieving the grantor's KDF settings and encrypted key, allowing the grantee to continue password recovery.

Instructions

Grantee begins password takeover: server returns grantor’s KDF settings + encrypted key

Input Schema

NameRequiredDescriptionDefault
formNo
paramsNo
emer_idYes
json_bodyNo

Schema Changelog

Changes observed during successful MCP inspections.

  1. Addedv0.2.2

TDQS

C2.5/5.0
Behavior3/5

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

The description adds useful behavior beyond annotations by disclosing that the server returns the grantor's KDF settings and encrypted key. It does not state authorization requirements, whether the takeover is reversible, or what state changes occur on the server, but the annotations already cover the broad safety profile (non-read-only, non-destructive, open-world).

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 a single compact sentence that front-loads the action and follows with the response payload. It is efficient, though its terseness contributes to the missing guidance elsewhere.

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?

This is part of a complex emergency-access workflow with four parameters and no output schema, yet the description only covers the action and returned data. It leaves out when to call it, parameter meaning, and how it relates to sibling emergency-access tools.

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%, so the description must compensate for all four parameters, yet it does not mention emer_id, form, params, or json_body. The only possible hint is the word 'grantor', which does not explain which parameter identifies it.

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

Purpose3/5

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

The description states a specific action (grantee begins password takeover) and a concrete result (server returns grantor KDF settings and encrypted key). However, it does not clearly distinguish this tool from several similar siblings such as initiate_emergency_access, password_emergency_access, approve_emergency_access, and view_emergency_access.

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 explicit guidance on when to use this tool versus the many other emergency-access-related tools. The reader must infer the lifecycle stage from the phrase 'begins password takeover', but no prerequisites, exclusions, or alternatives are named.

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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