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 agentmods add skills/metaschema-framework/claude-plugins/metaschema-java-librarynpx skills add metaschema-framework/claude-plugins --skill metaschema-java-librarygit 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-java-library)<a href="https://agentmods.dev/skills/metaschema-framework/claude-plugins/metaschema-java-library"><img src="https://agentmods.dev/badge/skills/metaschema-framework/claude-plugins/metaschema-java-library.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 | $0.00035 | $0.04766 |
| Opus 5 | $0.00017 | $0.02383 |
| Sonnet 5 | $0.00007 | $0.00953 |
| Haiku 4.5 | $0.00003 | $0.00477 |
Grade A, and why
metaschema-java-library 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 3d 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 — 691 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Using the metaschema-java Library
This skill covers how to use the metaschema-java library for loading modules, evaluating Metapath expressions, validating constraints, and serializing/deserializing data.
Related skills from the metaschema plugin (install with claude plugin install metaschema-framework:metaschema):
metaschema-module-authoring- Module structure, definitions, data typesmetaschema-constraints-authoring- Constraint types and validation patternsmetapath-expressions- Metapath syntax, operators, and functions
Module Structure
metaschema-framework (parent)
├── core - Core API, Metapath engine, model interfaces
├── databind - Data binding, serialization, code generation
├── schemagen - XML/JSON schema generation
├── databind-modules - Metaschema binding modules
├── metaschema-maven-plugin - Maven plugin for code/schema generation
├── metaschema-testing - Testing utilities
├── cli-processor - CLI framework
└── metaschema-cli - Command-line interface
Key Packages
| Package | Purpose |
|---|---|
dev.metaschema.core.model |
Model interfaces (IModule, IAssemblyDefinition, etc.) |
dev.metaschema.core.metapath |
Metapath expression engine |
dev.metaschema.core.metapath.function |
Function library |
dev.metaschema.core.metapath.item |
Item types (nodes, atomics) |
dev.metaschema.core.model.constraint |
Constraint validation |
dev.metaschema.databind |
Data binding context |
dev.metaschema.databind.io |
Serialization/deserialization |
dev.metaschema.databind.model.annotations |
Binding annotations (@BoundField, @BoundChoice, etc.) |
dev.metaschema.databind.codegen |
Code generation from Metaschema modules |
Annotation-Based Binding Model
The databind module provides annotation-based bindings that map Java classes to Metaschema definitions.
Core Binding Annotations
| Annotation | Purpose |
|---|---|
@MetaschemaAssembly |
Marks a class as a bound assembly definition |
@MetaschemaField |
Marks a class as a bound field definition |
@BoundAssembly |
Marks a field as a bound assembly instance |
@BoundField |
Marks a field as a bound field instance |
@BoundFlag |
Marks a field as a bound flag instance |
@BoundChoice |
Marks a field as part of a mutually exclusive choice |
@BoundChoiceGroup |
Marks a field as a polymorphic collection with discriminator |
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.
- 3d ago First seen · 691 lines · 35 tokens per session scan A fecfea4230b9
metaschema-java-library is a skill published in the GitHub repository metaschema-framework/claude-plugins (10 stars, last pushed 6mo ago), licensed CC0-1.0. It adds 35 tokens to every session and 4,766 once invoked, about $0.0002 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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