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/oscal-basicsnpx skills add metaschema-framework/claude-plugins --skill oscal-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/oscal-basics)<a href="https://agentmods.dev/skills/metaschema-framework/claude-plugins/oscal-basics"><img src="https://agentmods.dev/badge/skills/metaschema-framework/claude-plugins/oscal-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 | $0.00025 | $0.01461 |
| Opus 5 | $0.00013 | $0.00731 |
| Sonnet 5 | $0.00005 | $0.00292 |
| Haiku 4.5 | $0.00003 | $0.00146 |
Grade A, and why
oscal-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 6d 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 — 154 lines — stays where its author put it; the contents beside it link to each section on GitHub.
OSCAL Basics
OSCAL (Open Security Controls Assessment Language) is a set of standardized, machine-readable formats for security documentation developed by NIST.
For detailed model documentation, see the specific skills below.
Iron Rules
These rules MUST always be followed when creating or editing OSCAL content.
- Use random UUIDs. When creating UUIDs, always generate random (v4) UUIDs. Never use predictable, sequential, or deterministic UUIDs.
- Update the document-level UUID on every change. When creating or updating OSCAL content, set the top-level
uuidfield to a new random UUID. This signals that the document has changed and prevents stale references. - Never change system IDs. The
system-idfields are intended to be stable, unchanging identifiers. Do not regenerate or modify them.
OSCAL Layers and Models
Control Layer
Defines security controls and baselines.
| Model | Skill | Description |
|---|---|---|
| Catalog | oscal-catalog |
Organizes security controls with statements, parameters, and guidance |
| Profile | oscal-profile |
Selects and tailors controls to create baselines (e.g., FedRAMP Moderate) |
| Mapping | oscal-mapping |
Defines relationships between controls in different frameworks |
Implementation Layer
Documents how controls are implemented.
| Model | Skill | Description |
|---|---|---|
| Component Definition | oscal-component-definition |
Describes control implementations for reusable components |
| System Security Plan (SSP) | oscal-ssp |
Documents a system's security implementation against a baseline |
Assessment Layer
Covers evaluation and remediation.
| Model | Skill | Description |
|---|---|---|
| Assessment Plan (SAP) | oscal-assessment-plan |
Plans assessment scope, methods, and schedule |
| Assessment Results (SAR) | oscal-assessment-results |
Documents findings, observations, and risks |
| POA&M | oscal-poam |
Tracks remediation of identified weaknesses |
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.
- 6d ago First seen · 154 lines · 25 tokens per session scan A b393885ceaa9
oscal-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 25 tokens to every session and 1,461 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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