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Knuckles-Team

vaultwarden-mcp

Get collection users

vaultwarden_get_collection_users
Read-onlyIdempotent

List users and groups with access to one organization collection to audit or manage permissions.

Instructions

List users/groups with access to one collection

Input Schema

NameRequiredDescriptionDefault
formNo
col_idYes
org_idYes
paramsNo
json_bodyNo

Schema Changelog

Changes observed during successful MCP inspections.

  1. Addedv0.2.2

TDQS

C2.9/5.0
Behavior3/5

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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false, and openWorldHint=true, so the safety profile is covered. The description adds no behavioral context beyond the basic listing purpose, such as authorization requirements or response/pagination behavior, but it does not contradict 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.

Conciseness4/5

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

The description is a single front-loaded sentence with no wasted words. Its terseness is efficient, though it leaves out useful scoping details.

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 a simple read operation and annotations cover its safety profile, but with five parameters at 0% schema description coverage and no output schema, the one-line description is not complete enough. It does not clarify required identifiers or what the returned user/group access records contain.

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

Parameters2/5

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 five undocumented parameters. It only implies the collection being queried and does not explain org_id, col_id, form, params, or json_body, leaving most parameter meaning to be inferred.

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 gives a specific verb ('List') and resource ('users/groups with access to one collection'), so the operation is clear. It does not explicitly distinguish this tool from nearby siblings such as group-member or organization-collection listing tools, which keeps it below a 5.

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?

The description states what the tool returns but gives no guidance on when to use it versus alternatives like get_group_members, get_user_collections, or get_org_collection_detail. There are no prerequisites, exclusions, or selection criteria.

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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