New: 97,000+ skills indexed from GitHub repos with 100+ stars · every skill safety-checkedBrowse top skillsTop skills
Esc to closeBrowse all skills
Submit a skillBrowse skills
Submit a skillBrowse skills

Agent skill

Runtime Engine

by extra-org in extra-org/extra

Working on RuntimeEngine, ExecutionContext, agent execution, or the request lifecycle.

MITAuto-check passed

Install Runtime Engine

skills CLI
$ npx skills add extra-org/extra --skill runtime-engine -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install extra-org/extra runtime-engine --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/extra-org/extra.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.claude/skills/runtime-engine .claude/skills/runtime-engine && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
runtime-engine
GitHub stars
113
Token cost
~543 tokens
SKILL.md length
198 words
Files
1
Skills in repo
14
Repo updated
First seen
Licence
MIT

At a glance

Working on RuntimeEngine, ExecutionContext, agent execution, or the request lifecycle.

  • SKILL.md covers When to use this skill, Files to read first, Architecture rules and Implementation rules, plus 2 more sections
  • Calls make

What it does

Runtime Engine is an agent skill from extra-org/extra. Working on RuntimeEngine, ExecutionContext, agent execution, or the request lifecycle. Primary tasks are tasks/0003-compiled-agent-graph.md and tasks/0004-runtime-engine.md.

Its SKILL.md is about 540 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

The repository describes itself as: Turn your product into an AI-powered assistant. The licence is MIT.

Example prompts

  • “/runtime-engine”

What it can do on your machine

Read from SKILL.md and the folder at commit 023b0a0. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    Shell commands in SKILL.md call:

    • make

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Runtime Engine loads about 543 tokens when it runs. Until then it costs about 47 tokens; SKILL.md has 198 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~47
When it runs · the whole SKILL.md, loaded when a task matches
~543

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from extra-org/extra at commit 023b0a0, republished under its MIT licence (© extra-org). 198 words, ~543 tokens.

Download SKILL.mdSave it as .claude/skills/runtime-engine/SKILL.md (or your agent's skills folder).
name
runtime-engine
description
Working on RuntimeEngine, ExecutionContext, agent execution, or the request lifecycle. Primary tasks are tasks/0003-compiled-agent-graph.md and tasks/0004-runtime-engine.md.
generated
true
source
.ai/skills/runtime-engine.md
<!--
This file is generated by tools/skills.
Do not edit this file directly.
Edit .ai/skills/runtime-engine.md and run `make generate-ai`.
-->

Skill: Runtime Engine

When to use this skill

Use this when modifying RuntimeEngine, ExecutionContext, agent execution, or the request lifecycle. Primary tasks: tasks/0003-compiled-agent-graph.md, tasks/0004-runtime-engine.md.

Files to read first

  • AGENTS.md
  • docs/ARCHITECTURE.md
  • docs/RUNTIME_LIFECYCLE.md
  • docs/adr/0001-runtime-engine-created-once.md

Architecture rules

  • RuntimeEngine is long-lived, created once at startup from the CompiledAgentGraph.
  • ExecutionContext is per-request and carries all request-scoped state.
  • The compiled graph is immutable at runtime.
  • The runtime operates only on compiled, typed models — never raw YAML.

Implementation rules

  • Construct the engine only on startup paths; never inside request handlers.
  • Do not put request state (identity, tenant, current request, rendered prompts) on RuntimeEngine or the compiled graph.
  • Pass ExecutionContext explicitly through routing, context resolution, prompt rendering, and tool execution.
  • Keep the engine concurrency-safe by keeping it stateless w.r.t. requests.
  • Build the engine in src/agentplatform/runtime; the graph in src/agentplatform/graph.

Validation checklist

  • Engine constructed once (startup), not per request.
  • No request-scoped fields on the engine or graph.
  • All per-request data lives on ExecutionContext.
  • Compiled graph treated as immutable.
  • Tests cover concurrent requests not leaking state.
  • make check passes.

Common mistakes to avoid

  • Recreating the runtime or recompiling the graph per request.
  • Storing "current user/request" on the engine.
  • Mutating the compiled graph during execution.
  • Hidden global/singleton request state.

© extra-org, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in .claude/skills/runtime-engine of extra-org/extra.

Open the folder on GitHubat commit 023b0a0

Compare with similar skills

Runtime Engine next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Runtime Engine compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Runtime Engine this skillextra-org/extra113—~543Automated safety check: PassMIT
Primarygauss314/skills245—~4.4kAutomated safety check: PassMIT
Primary Plan Recommenderaipoch/medical-research-skills2k—~3.6kAutomated safety check: PassMIT
Ens Primary NameBankrBot/skills1.2k—~910Automated safety check: PassNone
Primary Sidebarcin12211/orca-q223—~2.6kAutomated safety check: PassMIT
Researchers Primary Sourcebitwize-music-studio/claude-ai-music-skills5361 repos~2.4kAutomated safety check: PassCC0-1.0

Similar skills

  • Primary

    gauss314/skills

    Trading API de Primary (Matba ROFEX): futuros, opciones, acciones, bonos.

    245 GitHub stars~4.4k tokensUpdated 3 mo ago
    Business, Finance & HRAuto-check passed

  • Primary Plan Recommender

    aipoch/medical-research-skills

    Compares multiple study-route options for the same biomedical research question and recommends one primary plan, while explicitly explaining why alternative routes are secondary, premature, weaker…

    2k GitHub stars~3.6k tokensUpdated 20 days ago
    Research & ScienceAuto-check passed

  • Ens Primary Name

    BankrBot/skills

    Set your primary ENS name on Base and other L2s. An agent skill from BankrBot/skills.

    1.2k GitHub stars~910 tokensUpdated 2 days ago
    Business, Finance & HRAuto-check passed

  • Primary Sidebar

    cin12211/orca-q

    Complete guide for adding, updating, and removing tabs in the Primary Sidebar of OrcaQ.

    223 GitHub stars~2.6k tokensUpdated 16 days ago
    DatabasesAuto-check passed

  • Researchers Primary Source

    bitwize-music-studio/claude-ai-music-skills

    Researches the subject's own words from tweets, blogs, forums, and chat logs.

    536 GitHub starsUsed in 1 repo~2.4k tokens
    Writing & ContentAuto-check passed

  • Primary Hardlight City

    Vieeeeeee/wibi-style

    Wibi Style 官方视觉风格：把一张照片转换成原色硬光都市。适合城市街道、建筑、公共交通、旅行纪实和环境人物照片。适用于用户要求原色硬光都市、上传照片换风格，或明确调用 $primary-hardlight-city 时。

    163 GitHub stars~240 tokensUpdated 7 days ago
    Media & CreativeAuto-check passed

More from extra-org/extra

All 14 skills in this repo

  • Testing

    extra-org/extra

    How to write and run fast, deterministic, behavior-focused pytest tests that never touch real external systems.

    113 GitHub stars~1.2k tokensUpdated 1 mo ago
    Auto-check passed

  • Architecture Review

    extra-org/extra

    Guard the project's architecture invariants. An agent skill from extra-org/extra.

    113 GitHub stars~1.1k tokensUpdated 1 mo ago
    Auto-check passed

  • Documentation

    extra-org/extra

    Keep the repository's documentation accurate, honest, and synchronized with the code.

    113 GitHub stars~848 tokensUpdated 1 mo ago
    Auto-check passed

  • Senior Python Engineering

    extra-org/extra

    The standard for writing Python here — small, typed, explicit, testable modules with side effects pushed to the edges.

    113 GitHub stars~1.4k tokensUpdated 1 mo ago
    Auto-check passed

  • Skill Authoring

    extra-org/extra

    How to create or restructure a skill so the .ai/skills/ system stays consistent, operational, and trustworthy.

    113 GitHub stars~1k tokensUpdated 1 mo ago
    Auto-check passed

  • Code Review

    extra-org/extra

    Senior-level code review for the agent platform — architecture and boundaries first, then correctness, security, testability, and simplicity.

    113 GitHub stars~1.3k tokensUpdated 1 mo ago
    Auto-check passed

Questions about Runtime Engine

What does Runtime Engine do?

Working on RuntimeEngine, ExecutionContext, agent execution, or the request lifecycle. Runtime Engine is an agent skill from extra-org/extra. Working on RuntimeEngine, ExecutionContext, agent execution, or the request lifecycle.

How do I install Runtime Engine in Claude Code?

Run `npx skills add extra-org/extra --skill runtime-engine -a claude-code`. Or copy the skill folder (.claude/skills/runtime-engine in extra-org/extra) into .claude/skills/runtime-engine in your project. Claude Code loads it when a task matches its description.

How do I install Runtime Engine in Codex?

Run `npx skills add extra-org/extra --skill runtime-engine -a codex`. Or copy the skill folder (.claude/skills/runtime-engine in extra-org/extra) into .agents/skills/runtime-engine in your project. Codex loads it when a task matches its description.

Can I use Runtime Engine in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add extra-org/extra --skill runtime-engine -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/runtime-engine, .gemini/skills/runtime-engine, .github/skills/runtime-engine and .opencode/skills/runtime-engine in your project.

What does Runtime Engine need to run?

Going by SKILL.md and its folder, Runtime Engine needs the command-line tools its instructions call (make).

Does Runtime Engine access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Runtime Engine safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Runtime Engine use?

Runtime Engine is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Runtime Engine use?

About 543 tokens (SKILL.md is roughly 2.2k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Runtime Engine?

Skills that share tags, products or a category with Runtime Engine: Primary (gauss314/skills, 245 stars), Primary Plan Recommender (aipoch/medical-research-skills, 2k stars), Ens Primary Name (BankrBot/skills, 1.2k stars) and Primary Sidebar (cin12211/orca-q, 223 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Runtime Engine?

extra-org (a GitHub organization) maintains it in extra-org/extra, which has 113 GitHub stars. The repository holds 14 skills in this directory. The repository was last updated on September 7, 2026.

Source: extra-org/extra on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.