Borrowing it
Nothing to install: this file belongs to P1-103n1x/bab-ilu. 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/P1-103n1x/bab-ilu/v2.2-oss-public/.claude/skills/evolve-lens/SKILL.mdgit clone --depth 1 https://github.com/P1-103n1x/bab-iluWrote 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/p1-103n1x/bab-ilu/evolve-lens)<a href="https://agentmods.dev/skills/p1-103n1x/bab-ilu/evolve-lens"><img src="https://agentmods.dev/badge/skills/p1-103n1x/bab-ilu/evolve-lens/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/p1-103n1x/bab-ilu/evolve-lens"><img src="https://agentmods.dev/badge/skills/p1-103n1x/bab-ilu/evolve-lens.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00121 | $0.02428 |
| Opus 5 | $0.00060 | $0.01214 |
| Sonnet 5 | $0.00024 | $0.00486 |
| Haiku 4.5 | $0.00012 | $0.00243 |
Grade A, and why
evolve-lens 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 12d 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 — 249 lines — stays where its author put it; the contents beside it link to each section on GitHub.
/evolve-lens — the second pair of eyes
What this does
/evolve-lens fulfills Bab-ilu's central philosophical claim from
PRD §0.5.2: "Bab-ilu 不是一个'知道规则'的系统，是一个'从实践中长出规则'的系统".
While the user works (ingests material, runs /ask, accepts syntheses,
names entities), a background observer accumulates their behavioral
pattern without listening to anything they say about what they're
doing — only what they do. When they invoke /evolve-lens, you
(Claude, the current session agent) perform a three-stage reasoning
pass over the observed behavior, looking for an academic tradition
whose structure is isomorphic to the user's unselfconscious pattern.
If you find one, you present the candidate theory with its four-piece
citation, the user decides whether to accept it, and on acceptance
Python tools install a new status: candidate lens under
<vault>/.agent/lenses/<id>/.
This skill runs entirely inside the current Claude Code session. No ANTHROPIC_API_KEY, no outbound LLM calls. Python tools provide deterministic work (file IO, prompt construction, response parsing); you provide all the LLM reasoning.
What this does NOT do
- Does not listen to directives. If the user runs
/evolve-lens find me something about phenomenology, the phrase "phenomenology" is ignored. The observer infers from behavior only. If the user wants output biased toward a specific direction, they must practice in that direction — ingest, query, take notes in that mode. - Does not invent new concepts. The rigor bar (see matcher prompt) excludes pop frameworks, TED-talk mental models, LLM-introduced concepts with no pre-2020 academic literature, and academic-laundered frameworks (Simon→Design Thinking, Aristotle→First Principles, etc.).
- Does not auto-activate. Generated lenses land at
.agent/lenses/<id>/withstatus: candidate. Switching to them is the user's explicit act via/genesisor by editing the active pointer.
Execution playbook — follow each step in order
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.
- 12d ago First seen · 249 lines · 0 tokens per session scan A 58cfeb705743
evolve-lens is a skill published in the GitHub repository P1-103n1x/bab-ilu (11 stars, last pushed 4mo ago), licensed MIT. It adds 121 tokens to every session and 2,428 once invoked, about $0.0006 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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