ase-meta-compat

ase-meta-compat is a skill for Claude Code from rse/ase. It costs 71 tokens per session (3,434 once invoked), scanned A, original, Apache-2.0.

An ASE compatibility self-test that checks whether a language model can correctly handle control flow, placeholders, pattern matching, and arithmetic.

In plain words
What is it for?
Running the compatibility test and receiving an overall rating based on its probes.
Why use it?
It shows how reliably the model can follow the interpreter rules that ASE skills depend on.

Skill for Claude Code

Written for Claude Code: disable-model-invocation in frontmatter. Also seen: positional $N argument.

Part of the ase plugin — 50 skills, 8 agents, 5 hooks shipped together

Good fit Running the compatibility test and receiving an overall rating based on its probes.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/rse/ase/ase-meta-compat
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 rse/ase --skill ase-meta-compat
Clone the repo
git clone --depth 1 https://github.com/rse/ase

Made for: Claude Code.

Or install ase, the plugin that ships this one along with the rest of its 50 skills, 8 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.

agentmods badge for ase-meta-compat

README.md
[![agentmods](https://agentmods.dev/badge/skills/rse/ase/ase-meta-compat.svg)](https://agentmods.dev/skills/rse/ase/ase-meta-compat)
Your own site
<a href="https://agentmods.dev/skills/rse/ase/ase-meta-compat"><img src="https://agentmods.dev/badge/skills/rse/ase/ase-meta-compat.svg" alt="Measured on agentmods" height="20"></a>
Per session 71 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,434 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. Third-party audits
  • NVIDIA SkillSpector pass 7 Sept 2026
How audits are shown
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 5.1 $0.00071 $0.03434
Opus 5 $0.00036 $0.01717
Sonnet 5 $0.00014 $0.00687
Haiku 4.5 $0.00007 $0.00343

Measured 8d ago against content hash 65d7d31367ba, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

Grade A, and why

ase-meta-compat 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.

plugin/skills/ase-meta-compat/SKILL.md · 288 lines

How it starts

The opening of the file, as written. The whole thing — 288 lines — stays where its author put it; the contents beside it link to each section on GitHub.

@${CLAUDE_SKILL_DIR}/../../meta/ase-control.md

If $1 (the first token of the skill arguments) is equal to -h or --help, you MUST once output the following output and then IMMEDIATELY STOP the further skill processing:

Self-Test ASE Compatibility

Objective

Self-test how faithfully the current LLM (and its harness) executes the four core interpreter primitives that every ASE skill silently relies on -- control flow, XML placeholders, regex matching, and arithmetic -- and report an overall 0%…100% compatibility rating.

This skill is unusual: it is both the test definition and the system under test. Each probe is a pure ASE construct that you execute, recording its actual result. You MUST NOT compare against any expected value until STEP 6. Do not fabricate passes: a probe whose actual result differs from its expected result MUST be recorded as a fail.

Notice that this skill intentionally does not strictly follow the ASE skill format; in particular, it does not include the usual meta skill information.

Procedure

  1. STEP 1: Initialize Self-Test

    Initialize the running map of actual probe results (set to empty) -- every probe in STEPs 2-5 stores its result here as a <category/>/<probe-name/> entry with its actual computed value.

    Initialize the running list of failed probes (set to empty) -- this is populated only in STEP 6 after comparing actuals against the expected values.

  2. STEP 2: Probe XML Placeholders

    Execute all of the following XML-placeholder probes (in the given order). For each probe, record the actual result in under the key xml-placeholders/<probe-name/>. Do not compare to any expected value here.

    1. get-and-set: Set 42, then get . Record actual result for xml-placeholders/get-and-set.

    2. self-ref: Set 42, then set <v>pre_<v/></v>, then get . Record actual result for xml-placeholders/self-ref.

    3. overwrite: Set 42, then set <v>99</v>, then get . Record actual result for xml-placeholders/overwrite.

    4. indexed: Set <eval-1-2>+1</eval-1-2> and <eval-2-1>-1</eval-2-1>, then get and via <eval-1-2/>,<eval-2-1/>. Record actual result for xml-placeholders/indexed.

    5. nested-attr: With 20, build the value of an XML attribute width="<w/>" and read the attribute width back. Record actual result for xml-placeholders/nested-attr.

    6. entity: Evaluate the XML entity &#x29BF; and get the rendered Unicode character. Record actual result for xml-placeholders/entity.

    Set to the number of XML-placeholder probes above.

  3. STEP 3: Probe Control Flow

    Execute all of the following control-flow probes (in the given order). For each probe, record the actual result in under the key control-flow/<probe-name/>. Do not compare to any expected value here.

    1. branch: Set 3, then evaluate <if condition="<a/> is greater than 5">big</if> <elseif condition="<a/> is greater than 2">mid</elseif> <else>small</else>. Record actual result for control-flow/branch.

    2. while-sum: Set 0 and 1, then evaluate <while condition="<i/> is less than or equal to 5"> set <s/> to <s/> + <i/>, set <i/> to <i/> + 1 </while>. Record as actual result for control-flow/while-sum.

    3. for-order: Set , then evaluate <for items="x y z"><s><s/>-<item/></s></for>. Record as actual result for control-flow/for-order.

    4. while-break: Set 1 and , then evaluate <while condition="<i/> is less than or equal to 9"> if <i/> equals 4 set <hit/> to <i/> and <break/>, else set <i/> to <i/> + 1 </while>. Record as actual result for control-flow/while-break.

Read the full file on GitHub · 288 lines

Files

What ships with it

1 file 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.

  1. 8d ago First seen · 288 lines · 71 tokens per session scan A 65d7d31367ba

Subscribe to this mod's changes

ase-meta-compat is a skill published in the GitHub repository rse/ase (47 stars, last pushed today), licensed Apache-2.0. It adds 71 tokens to every session and 3,434 once invoked, about $0.0004 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 2026-08-30.

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