tiny-agent-sandbox

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sandbox_status

Check Docker daemon readiness and identify any missing allowlisted runtime images required for secure sandbox execution.

Instructions

Report Docker daemon readiness and any missing allowlisted runtime images.

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": "sandbox_status"
  }
}

Input Schema

Name	Required	Description	Default
No arguments

Output Schema

Name	Required	Description	Default
`error`	No
`images`	Yes
`missing_images`	Yes
`server_version`	No
`daemon_available`	Yes
`docker_available`	Yes

Schema Changelog

Changes observed during successful MCP inspections.

First observedv0.1.0Aug 4, 2026

TDQS

A3.7/5.0

Behavior3/5

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

No annotations are provided, so the description carries the behavioral burden. It conveys this is a read-only status operation (reports, doesn't modify). However, it doesn't mention whether it performs any setup actions, caches results, or has delays. The read-only implication is reasonably clear given 'report'.

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?

A single sentence that efficiently conveys the tool's purpose with zero waste. It names both things it reports on (daemon readiness and missing images) without redundancy. This is appropriately concise for a zero-parameter status tool.

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?

For a zero-parameter status check tool with an output schema present, the description is largely complete. It identifies what the tool checks (daemon readiness, missing images). It doesn't describe return value format, but the output schema exists to cover that. Could mention whether readiness implies run_code will succeed, but overall adequate.

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?

The tool has zero parameters, so there is nothing the description needs to add about parameters. The baseline for 0-parameter tools is 4 per the rubric, and the description correctly contains no parameter-specific information since none exist.

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 clearly states the tool reports Docker daemon readiness and missing allowlisted runtime images. The verb 'report' with specific resources (Docker daemon readiness, runtime images) is specific. It distinguishes itself from run_code by being a status/read tool rather than an execution tool.

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?

The context implies this is a readiness/health check tool—likely to be called before run_code to verify the sandbox environment. However, it doesn't explicitly state when to use it (e.g., 'check before running code') or contrast with alternatives. The usage pattern with run_code is implied but not 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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