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/jl-cmd/claude-dev-env/e-simplifynpx skills add jl-cmd/claude-dev-env --skill e-simplifygit clone --depth 1 https://github.com/jl-cmd/claude-dev-envWhat 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 | $0.00044 | $0.00920 |
| Opus 5 | $0.00022 | $0.00460 |
| Sonnet 5 | $0.00009 | $0.00184 |
| Haiku 4.5 | $0.00004 | $0.00092 |
Grade A, and why
e-simplify 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 3d 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 — 98 lines — stays where its author put it; the contents beside it link to each section on GitHub.
e-simplify
Core principle: Four parallel cleanup angles (reuse, simplification, efficiency, altitude) over the current diff, applied directly — not a bug hunt, and not a report.
Gotchas
- This skill fixes code quality, not correctness. A request for bug-hunting belongs to
/e-code-review, not here — see the refusal case below. - Applying a fix that changes intended behavior, or that reaches well outside the reviewed diff, is worse than leaving a flagged item unfixed — skip and note it instead of stretching the fix to cover it.
When this skill applies
Triggers: /e-simplify on the current diff (or a PR/branch/path passed as an argument).
Refusal cases — first match wins:
- Asked to find correctness bugs (crashes, wrong output, security issues) rather than cleanup. Respond exactly:
That's a correctness review — use /e-code-review, not this skill.
The process
/simplify → 4 cleanup agents in parallel → apply the fixes
You are improving the quality of the changed code, not hunting for bugs. Review
it for reuse, simplification, efficiency, and altitude issues, then fix what you
find. Do not look for correctness bugs — that is what /code-review is for.
Phase 0 — Gather the diff
Run git diff @{upstream}...HEAD (or git diff main...HEAD / git diff HEAD~1
if there's no upstream) to get the unified diff under review. If there are
uncommitted changes, or the range diff is empty, also run git diff HEAD and
include the working-tree changes in scope — the review often runs before the
commit. If a PR number, branch name, or file path was passed as an argument,
review that target instead. Treat this diff as the review scope.
Phase 1 — Review (4 cleanup agents in parallel)
Launch 4 independent review agents via the Agent tool, all in a
single message so they run concurrently. Pass each agent the diff and one of
the four angles below. Each returns its findings with file, line, a
one-line summary, and the concrete cost (what is duplicated, wasted, or
harder to maintain).
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.
- 3d ago First seen · 98 lines · 44 tokens per session scan A bfc558d63ba0
e-simplify is a skill published in the GitHub repository jl-cmd/claude-dev-env (6 stars, last pushed 3d ago), licensed MIT. It adds 44 tokens to every session and 920 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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