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A2UI Atomic Catalog

by ai.a2uicatalog
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render_ping

Read-only

Diagnostic: render a tiny test view in-chat (MCP Apps hosts only). Proves view mounting works independent of the full catalog renderer. Echoes back whatever payload you pass.

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": "render_ping"
  }
}

Input Schema

NameRequiredDescriptionDefault
payloadNoAny JSON object; it is echoed back as the result so you can see what the view received. Optional.

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observed

TDQS

A4.3/5.0
Behavior4/5

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

Annotations already declare readOnlyHint=true and destructiveHint=false, so the description adds real context: the host-type restriction and the fact that the payload is echoed back to reveal what the view received. That is useful beyond the structured fields, though it doesn't describe visible output or error behavior on unsupported hosts.

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?

Three short sentences, front-loaded with 'Diagnostic:', zero redundant wording. Each sentence adds a distinct fact (purpose, scope, echo behavior).

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?

For a one-optional-parameter diagnostic with no output schema, the description covers purpose, prerequisites (MCP Apps hosts), and return behavior (payload echoed back). Nothing an agent needs to call it correctly 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?

Schema coverage is 100% and the single parameter already documents that any JSON object is echoed back, so the description's echo statement largely restates the schema. Baseline 3 applies when the schema carries the parameter semantics.

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?

States a specific verb+resource ('render a tiny test view in-chat') and immediately frames it as a diagnostic distinct from the 'full catalog renderer' used by siblings like render_surface.

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?

Clearly indicates when to use it (proving view mounting works) and implicitly when not to (real renders, since it's a tiny test view independent of the full renderer). It also gates usage to 'MCP Apps hosts only', though it doesn't name a specific alternative sibling to use instead.

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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