onboard

A project-onboarding skill that examines an existing codebase and creates SubFrame project records. These records describe the project’s structure, important decisions, and initial tasks.

In plain words
What is it for?
It surveys files, project manifests, readme files, AI instructions, and existing SubFrame records. It can create STRUCTURE.json, PROJECT_NOTES.md, and initial subtasks, or show the proposed output in dry-run mode.
Why use it?
It gives an unfamiliar codebase a documented starting point instead of requiring developers to map everything manually. This makes later work easier for both people and coding agents.

Skill for Claude CodeCodex

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.

agentmods
npx agentmods add skills/codename-11/subframe/onboard
Any agent
npx skills add Codename-11/SubFrame --skill onboard
Clone the repo
git clone --depth 1 https://github.com/Codename-11/SubFrame

Made for: Claude Code, Codex.

Per session 32 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,766 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00032 $0.01766
Opus 5 $0.00016 $0.00883
Sonnet 5 $0.00006 $0.00353
Haiku 4.5 $0.00003 $0.00177

Measured 2d ago against content hash ca6eb4c8bea4, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

onboard 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 2d 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.

.agents/skills/onboard/SKILL.md · 215 lines

How it starts

The opening of the file, as written. The whole thing — 215 lines — stays where its author put it; the contents beside it link to each section on GitHub.

SubFrame Onboard

Analyze an existing project and bootstrap SubFrame-compatible output files: .subframe/STRUCTURE.json, .subframe/PROJECT_NOTES.md, and initial sub-tasks.

Dynamic Context

Root directory listing: !ls -la

Package manifest: !cat package.json 2>/dev/null || cat pyproject.toml 2>/dev/null || cat Cargo.toml 2>/dev/null || echo "No package manifest found"

Project overview: !head -100 README.md 2>/dev/null || echo "No README found"

AI configuration (Codex): !head -50 AGENTS.md 2>/dev/null || echo "No AGENTS.md found"

AI configuration (Gemini): !head -50 GEMINI.md 2>/dev/null || echo "No GEMINI.md found"

Source file survey: !find . -maxdepth 2 -name "*.ts" -o -name "*.tsx" -o -name "*.py" -o -name "*.rs" -o -name "*.go" -o -name "*.java" -o -name "*.rb" 2>/dev/null | head -50

Existing SubFrame state: !cat .subframe/STRUCTURE.json 2>/dev/null || echo "No STRUCTURE.json yet"

Instructions

Argument: `$ARGUMENTS`

Dry-Run Mode

If `$ARGUMENTS` contains `--dry-run`, do not write any files. Instead, show the full output that would be written for each file, clearly labeled with the target path. Then stop.

Step 1: Analyze the Project

Using the gathered dynamic context, determine:

  1. Project type — What kind of project is this? (web app, CLI tool, library, monorepo, etc.)
  2. Language and framework — Primary language, framework, and build tooling
  3. Architecture — Entry points, module structure, process model (single, client-server, microservices, etc.)
  4. Key modules — Identify the most important source files and their purposes (scan up to 3 directory levels deep)
  5. Existing documentation — What context already exists in README, AGENTS.md, GEMINI.md, or other docs?
  6. Dependencies — Key runtime and dev dependencies from the package manifest

Step 2: Generate STRUCTURE.json

Build a SubFrame-compatible `STRUCTURE.json` following this schema:

Read the full file on GitHub · 215 lines

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. 2d ago First seen · 215 lines · 32 tokens per session scan A ca6eb4c8bea4

Subscribe to this mod's changes

onboard is a skill published in the GitHub repository Codename-11/SubFrame (10 stars, last pushed 8d ago), licensed MIT. It adds 32 tokens to every session and 1,766 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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