Borrowing it
Nothing to install: this file belongs to gotgenes/pi-anthropic-auth. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/gotgenes/pi-anthropic-auth/main/.pi/skills/pi-extension-lifecycle/SKILL.mdgit clone --depth 1 https://github.com/gotgenes/pi-anthropic-authWrote 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.
[](https://agentmods.dev/skills/gotgenes/pi-anthropic-auth/pi-extension-lifecycle)<a href="https://agentmods.dev/skills/gotgenes/pi-anthropic-auth/pi-extension-lifecycle"><img src="https://agentmods.dev/badge/skills/gotgenes/pi-anthropic-auth/pi-extension-lifecycle/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.
<a href="https://agentmods.dev/skills/gotgenes/pi-anthropic-auth/pi-extension-lifecycle"><img src="https://agentmods.dev/badge/skills/gotgenes/pi-anthropic-auth/pi-extension-lifecycle.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00040 | $0.02731 |
| Opus 5.5 | $0.00016 | $0.01092 |
| Sonnet 5.5 | $0.00008 | $0.00546 |
| Haiku 4.5 | $0.00004 | $0.00273 |
Grade A, and why
pi-extension-lifecycle 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.
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 — 265 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Pi Extension Lifecycle Reference
Agent loop structure (from source)
Source: packages/agent/src/agent-loop.ts in pi-mono.
agent_start
│
▼
OUTER LOOP ─────────────────────────────────────────────────
│ INNER LOOP (while hasMoreToolCalls || pendingMessages)
│ │
│ │ turn_start
│ │ │
│ │ ▼
│ │ Process pendingMessages
│ │ (steering messages from previous turn are injected
│ │ as user/custom messages BEFORE the LLM call)
│ │ │
│ │ ▼
│ │ context event (extensions can modify messages)
│ │ before_provider_request
│ │ │
│ │ ▼
│ │ ┄┄┄ LLM generates response ┄┄┄
│ │ │
│ │ ▼
│ │ after_provider_response
│ │ message_start → message_update(s) → message_end
│ │ │
│ │ ▼
│ │ Extract tool calls from assistant message
│ │ │
│ │ ▼
│ │ Execute tool calls SEQUENTIALLY:
│ │ ┌──────────────────────────────────────────────┐
│ │ │ For each tool call: │
│ │ │ tool_execution_start │
│ │ │ tool_call (beforeToolCall) │
│ │ │ → can BLOCK (returns error to agent) │
│ │ │ → can MODIFY input (mutate event.input) │
│ │ │ → handler is AWAITED before tool runs │
│ │ │ ┄┄┄ tool executes ┄┄┄ │
│ │ │ tool_execution_end │
│ │ │ tool_result (afterToolCall) │
│ │ │ → can MODIFY result content/details │
│ │ │ → handler is AWAITED │
│ │ └──────────────────────────────────────────────┘
│ │ │
│ │ ▼
│ │ turn_end ← AWAITED before next turn_start
│ │ │
│ │ ▼
│ │ shouldStopAfterTurn? (not used by coding-agent)
│ │ │
│ │ ▼
│ │ pendingMessages = getSteeringMessages()
│ │ │
│ │ └── loop back if hasMoreToolCalls || pendingMessages
│ │
│ ▼
│ followUpMessages = getFollowUpMessages()
│ if followUp messages → pendingMessages = followUp, continue outer loop
│ else → break
│
└───────────────────────────────────────────────────────────
│
▼
agent_end
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 Changed · -4 lines · -30 tokens per session 84add1f7a2f0
- 2mo ago First seen · 269 lines · 70 tokens per session scan A 29a9719e46e8
pi-extension-lifecycle is a skill published in the GitHub repository gotgenes/pi-anthropic-auth (426 stars, last pushed 13d ago), licensed MIT. It adds 40 tokens to every session and 2,731 once invoked, about $0.0002 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 2026-08-30.
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