Handsome Hosting

List environment variables

list_env

Read-only

Names of the environment variables the project declares or has stored, with a flag for stored ones. Values are never returned.

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "serviceId": "<serviceId>"
    },
    "name": "list_env"
  }
}

Input Schema

Name	Required	Description	Default
`serviceId`	Yes	the id of a service on this account

Output Schema

Name	Required	Description	Default
`ok`	Yes
`data`	No
`error`	No

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedOct 26, 2026

changedInput schema / properties / serviceId / description

Previous value: -"the service id from list_services"New value: +"the id of a service on this account"

First observedOct 23, 2026

TDQS

A3.9/5.0

Behavior4/5

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

Annotations already declare readOnlyHint=true, so the safety profile is covered. The description adds genuinely useful behavioral context beyond that: values are never returned (secrets stay hidden) and a flag marks which variables are actually stored versus merely declared. It does not cover permissions, ordering, or scale of results.

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 short sentences with zero filler. The statement of what is returned comes first, and the important constraint (values never returned) is front-loaded rather than buried.

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

Completeness5/5

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

An output schema exists, so return-value explanation is not required, yet the description still summarizes the shape (names plus a stored flag). For a one-parameter read-only tool with full annotation coverage, nothing an agent needs is missing.

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?

There is a single parameter with 100% schema description coverage, so the schema already defines serviceId as a service UUID on the account. The description only loosely gestures at it via 'the project,' adding no meaning beyond the schema. Baseline 3 applies.

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 resource (environment variable names) and its scope: variables the project 'declares or has stored,' with a flag distinguishing stored ones. It is clearly a read-only listing operation and implicitly the counterpart of set_env, though it never names that sibling to sharpen the contrast.

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

Usage Guidelines3/5

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

Usage is only implied — a 'list' of env var names before calling set_env is the obvious reading, but the description never says when to use this versus alternatives or any prerequisites. No exclusions or conditions are stated.

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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