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/autohandai/code-cli/extension-buildernpx skills add autohandai/code-cli --skill extension-buildergit clone --depth 1 https://github.com/autohandai/code-cliWhat 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 | $0.00069 | $0.01126 |
| Opus 5 | $0.00034 | $0.00563 |
| Sonnet 5 | $0.00014 | $0.00225 |
| Haiku 4.5 | $0.00007 | $0.00113 |
Grade A, and why
extension-builder 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.
How it starts
The opening of the file, as written. The whole thing — 66 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Build Autohand extensions
Turn the user's description or source package into a working Autohand extension. Finish with an installed, fresh-process-verified result when the user asked for installation. Use the trusted runtime contract for commands, TUI, keybindings, flags, hooks, providers, or permission policy; modify Autohand itself only when the versioned extension API cannot represent the behavior and the current workspace is the Autohand source repository.
Load the relevant contract
- Read references/autohand-extension-v1.md before creating or changing an Autohand extension package.
- Also read references/pi-compatibility.md when the request mentions Pi, pi-mono, a
pipackage manifest,registerTool,registerCommand, Pi events, or Pi skills.
Workflow
- Inspect the exact target, repository instructions, existing manifest, related contributions, and tests before editing.
- Turn the request into observable capabilities: tool names and parameters, agent behavior, Agent Skills, permission boundaries, lifecycle behavior, and installation scope.
- Choose the delivery shape:
- Use declarative contributions for shell-template tools, focused agents, and Agent Skills.
- Use a trusted runtime entrypoint for slash commands, Ink views, status/help segments, shortcuts, flags, hooks, providers, or permission policies.
- Extend the existing package when the user named one; preserve its id and compatible behavior.
- Change Autohand source only when the versioned runtime API cannot represent the required behavior.
- Use a hybrid only when the boundary is explicit and each part is independently testable.
- Write a failing test or validation fixture before production code. For TUI, startup, prompt, menu, or screen behavior, add Tuistory coverage.
- Implement the smallest complete capability. Reuse existing tools, permission checks, hooks, registries, and runtime layers.
- Validate and exercise the complete lifecycle:
What ships with it
3 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.
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.
- 2d ago First seen · 66 lines · 69 tokens per session scan A d60bbdbae0e1
extension-builder is a skill published in the GitHub repository autohandai/code-cli (181 stars, last pushed 5d ago), licensed Apache-2.0. It adds 69 tokens to every session and 1,126 once invoked, about $0.0003 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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