What is skill-compat-matrix?

A compatibility reporting tool that compares a skill's fields and bundled files across different agent runtimes, or harnesses. It distinguishes shared fields from settings that only work in particular runtimes.

Use it to generate a compatibility matrix for one skill or an entire repository, including portable fields, scripts, references, hooks, and paths.

It helps reveal which parts of a skill can be reused across platforms and which parts may need runtime-specific handling.

skill-compat-matrix — Skill for Claude Code by wyattowalsh/agents

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.

Any agent

npx skills add wyattowalsh/agents --skill skill-compat-matrix

Clone the repo

git clone --depth 1 https://github.com/wyattowalsh/agents

Made for: Claude Code.

Or install agents, the plugin that ships this one along with the rest of its 71 skills, 20 agents, 5 hooks.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/wyattowalsh/agents/skill-compat-matrix/github.svg)](https://agentmods.dev/skills/wyattowalsh/agents/skill-compat-matrix)

Your own site

<a href="https://agentmods.dev/skills/wyattowalsh/agents/skill-compat-matrix"><img src="https://agentmods.dev/badge/skills/wyattowalsh/agents/skill-compat-matrix/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/wyattowalsh/agents/skill-compat-matrix"><img src="https://agentmods.dev/badge/skills/wyattowalsh/agents/skill-compat-matrix.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 32 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 415 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

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.

Model	Per session	Once invoked
Fable 5.1	$0.00032	$0.00415
Opus 5.5	$0.00013	$0.00166
Sonnet 5.5	$0.00006	$0.00083
Haiku 4.5	$0.00003	$0.00042

Measured 1mo ago against content hash a654b927bbdb, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

skill-compat-matrix 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 1mo ago.

The scan reads SKILL.md. This mod also ships 3 executable files (scripts/asset_toolkit/validate_hooks.py, scripts/check.py, scripts/compat_matrix.py), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

skills/skill-compat-matrix/SKILL.md · 59 lines

What it actually says

Skill Compat Matrix

Summarize how a skill's frontmatter and bundled assets map to supported harnesses.

Scope: Compatibility reporting only. Does not install skills or edit harness configs.

Dispatch

$ARGUMENTS	Action
`<name>`	Matrix for one skill
`repo` / `--all`	Matrix summary for all repo skills
`--format json`	Machine-readable report
Empty	Show harness list and field tiers

Field Tiers

Tier	Examples
portable-core	`name`, `description`, `license`, `metadata`
portable-but-variable	`allowed-tools`, scripts, references
runtime-specific	`user-invocable`, `hooks`, `context`, `paths`

Load skills/skill-creator/references/runtime-compatibility.md when interpreting results.

Workflow

uv run python skills/skill-compat-matrix/scripts/compat_matrix.py <name>
uv run python skills/skill-compat-matrix/scripts/compat_matrix.py --all --format json

Validation Contract

uv run python skills/skill-compat-matrix/scripts/check.py

Critical Rules

Mark unknown or best-effort harness behavior explicitly.
Never treat runtime-specific fields as portable safety controls.
Pair matrix output with skill-creator security audit for executable surfaces.
Do not mutate harness projections from this skill.
Include install-path notes only as documentation, not commands to run.

Files

What ships with it

4 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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.

1mo ago First seen · 59 lines · 32 tokens per session scan A a654b927bbdb

Subscribe to this mod's changes

skill-compat-matrix is a skill published in the GitHub repository wyattowalsh/agents (5 stars, last pushed 1mo ago), licensed MIT. It adds 32 tokens to every session and 415 once invoked, about $0.0001 per session on Opus 5.5. 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 2026-09-03.

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