schema-designer

A schema-designing agent for creating JSON Schemas, formal rules that describe the shape and types of data passed between agents. It also checks for naming conflicts with existing schemas.

In plain words
What is it for?
Use it to define a new inter-agent artifact, specify its producers and consumers, and receive a schema filename, conflict list, and reasoning.
Why use it?
It helps keep shared agent data consistent and exposes incompatible field definitions before other agents depend on them.

Agent

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add agents/orin-dx/agent-plugins/schema-designer
Clone the repo
git clone --depth 1 https://github.com/orin-dx/agent-plugins
Per session 120 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 713 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00120 $0.00713
Opus 5 $0.00060 $0.00357
Sonnet 5 $0.00024 $0.00143
Haiku 4.5 $0.00012 $0.00071

Measured 2d ago against content hash b523687326de, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

schema-designer scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

plugins/mason/agents/schema-designer.md · 45 lines

What it actually says

Return this JSON:

{
  "schema": {},
  "filename": "[email protected]",
  "conflicts": ["string"],
  "reasoning": "string"
}

WHEN an existing schema defines a field with the same name and a different type, THE AGENT SHALL list it in conflicts and propose a disambiguating field name.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2d ago First seen · 45 lines · 120 tokens per session scan A b523687326de

Subscribe to this mod's changes

schema-designer is an agent published in the GitHub repository orin-dx/agent-plugins (1 stars, last pushed 5d ago), licensed MIT. It adds 120 tokens to every session and 713 once invoked, about $0.0006 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Related

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INSTALL

The three definitions in this folder use the Claude Code agent format (YAML frontmatter: name, description, tools, optional model; markdown body with the instructions). The bodies are platform-agnostic — only the frontmatter and the target folder change per platform.

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