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.
npx skills add metaschema-framework/claude-plugins --skill metaschema-basicsgit clone --depth 1 https://github.com/metaschema-framework/claude-pluginsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/metaschema-framework/claude-plugins/metaschema-basics)<a href="https://agentmods.dev/skills/metaschema-framework/claude-plugins/metaschema-basics"><img src="https://agentmods.dev/badge/skills/metaschema-framework/claude-plugins/metaschema-basics.svg" alt="Measured on agentmods" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00023 | $0.00608 |
| Opus 5 | $0.00012 | $0.00304 |
| Sonnet 5 | $0.00005 | $0.00122 |
| Haiku 4.5 | $0.00002 | $0.00061 |
Grade A, and why
metaschema-basics 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 8d 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.
How it starts
The opening of the file, as written. The whole thing — 71 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Metaschema Basics
Metaschema is an information modeling framework that allows defining data models in a format-agnostic way, generating XML and JSON schemas from a single source, and specifying constraints and validation rules.
Core Concepts
Module
A Metaschema file defining a model or portion of a model. Modules can import other modules.
→ For details: See metaschema-module-authoring skill (creating or understanding modules)
Definition Types
| Type | Description | Example |
|---|---|---|
| Assembly | Complex structure containing fields and other assemblies | catalog, control, metadata |
| Field | Simple data element with a typed value | title, description, email |
| Flag | Attribute/property on an assembly or field | id, uuid, class |
→ For details: See metaschema-module-authoring skill (structure, data types, cardinality)
Constraints
Validation rules applied to data instances:
allowed-values- Enumerated value setsexpect- Assertions that must be truematches- Regex and datatype validationhas-cardinality- Occurrence count rulesindex/index-has-key- Cross-reference validationis-unique- Uniqueness enforcement
→ For details: See metaschema-constraints-authoring skill (creating or understanding constraints)
Metapath
XPath 3.1-based expression language for navigating and querying Metaschema data:
./control[@id = 'AC-1'] # Find control by ID
.//param[exists(./value)] # Find params with values
ancestor::catalog/metadata/title # Navigate to catalog title
→ For details: See metapath-expressions skill (syntax, operators, functions)
Data Formats
Metaschema supports three equivalent serialization formats:
- XML (
.xml) - JSON (
.json) - YAML (
.yaml)
A model defined in Metaschema can parse and serialize to any of these formats.
When to Use Which Skill
| Task | Skill |
|---|---|
| Understanding or writing modules | metaschema-module-authoring |
| Understanding or writing constraints | metaschema-constraints-authoring |
| Understanding or writing Metapath expressions | metapath-expressions |
| Quick conceptual overview (you are here) | metaschema-basics |
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.
- 8d ago First seen · 71 lines · 23 tokens per session scan A 80b1daf04b7f
metaschema-basics is a skill published in the GitHub repository metaschema-framework/claude-plugins (10 stars, last pushed 6mo ago), licensed CC0-1.0. It adds 23 tokens to every session and 608 once invoked, about $0.0001 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.
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