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unfour

unfour

by zyqzyq
OverviewSchemaSourceRelated ServersDiscussionsAdmin
Rust
Local

List Database Connections

unfour.db.list_connections
Read-onlyIdempotent

List saved database connections for the active workspace. Returns safe summaries without passwords, tokens, or connection strings.

Instructions

Lists saved database connections for the active workspace through the Unfour command bus. Returns safe summaries without passwords, tokens, or connection strings.

Tool call template

This tool declares no required parameters. Add optional parameters from the input schema as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {},
    "name": "unfour.db.list_connections"
  }
}

Input Schema

NameRequiredDescriptionDefault
workspaceIdNoOptional workspace ID. Uses the active workspace if omitted.

Output Schema

NameRequiredDescriptionDefault
countYes
sourceYes
connectionsYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.1.0

TDQS

A4.2/5.0
Behavior4/5

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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, so the safety profile is covered. The description adds valuable context: it returns 'safe summaries without passwords, tokens, or connection strings', which is important behavioral information beyond the annotations. No contradiction.

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

Conciseness5/5

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

Two sentences, zero waste. The first sentence states the purpose and scope, the second adds a critical safety detail. Perfectly front-loaded and concise.

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

Completeness4/5

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

The tool is simple (1 optional param, no required params, output schema exists). The description covers the purpose, scope, and a key safety behavior. It doesn't describe the output format, but the output schema exists, so that's not required. Complete enough for a list operation.

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

Parameters3/5

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

Schema description coverage is 100% for the single optional parameter (workspaceId), so the schema already documents it. The description adds the context that it uses the active workspace if omitted, which is helpful but not extensive. Baseline 3 is appropriate.

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

Purpose5/5

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

The description clearly states the tool lists saved database connections for the active workspace, using a specific verb ('Lists') and resource ('saved database connections'). It distinguishes from siblings like unfour.connection.list and unfour.ssh.list_connections by specifying 'database' and 'active workspace'.

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

Usage Guidelines4/5

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

The description implies usage context: it's for listing database connections in the active workspace, and the optional workspaceId parameter allows targeting a different workspace. It doesn't explicitly state when not to use it or name alternatives, but the context is clear enough given the sibling tools.

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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