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mir-shakir

readonly-db-mcp

by mir-shakir

list_connections

Discover available database connections with details on schemas, gated status, and enabled state to identify targets for queries.

Instructions

List the connections you can query, with each one's default schema, any described schemas, whether it is gated (require_opt_in) and currently enabled.

Call this FIRST when unsure what to target. Query one with run_select(..., connection=, schema=). Gated connections show enabled=false until RODB_ENABLE_GATED opts them in.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault

No arguments

Behavior4/5

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

No annotations provided, so description carries full burden. It discloses the return details including schema, gated status, and enabled status. Explains that gated connections show enabled=false until opted in. Does not mention any side effects or limitations, but for a listing tool, this is adequate.

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, concise and well-structured. Front-loads main purpose, then adds usage guidance. No unnecessary words.

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?

Given zero parameters, no output schema, and simple listing functionality, the description covers what is returned, how to use results, and the special case of gated connections. Could mention that it returns a list of connection objects but is still complete enough.

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

Parameters4/5

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

No parameters exist, so baseline is 4. Description adds no parameter info, which is expected. Schema coverage is 100% by default since no properties.

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 verb 'List' and the resource 'connections', and details the specific information provided (default schema, described schemas, gated status, enabled status). It also distinguishes from siblings by recommending to call this first when unsure what to target.

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?

Provides explicit when-to-use guidance ('Call this FIRST when unsure what to target') and explains how to proceed with querying connections using run_select. Also describes the behavior of gated connections and how to enable them. Lacks explicit when-not-to-use, but the context is clear.

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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