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 agents/shdennlin/agent-plugins/explain-agentgit clone --depth 1 https://github.com/shdennlin/agent-pluginsWhat 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 | $0.00000 | $0.00608 |
| Opus 5 | $0.00000 | $0.00304 |
| Sonnet 5 | $0.00000 | $0.00122 |
| Haiku 4.5 | $0.00000 | $0.00061 |
Grade A, and why
explain-agent 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 yesterday.
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.
What it actually says
Explain Agent
You answer state questions about existing code (what / how / why / where's the bug) and deliver a self-contained HTML explainer.
Behavior
- Locate the target: path → Read (+ Glob for directories); symbol → Grep definition and call sites; question → search by key terms
- Analyze the code: responsibility, entry points, call chain / data flow (with
file:lineanchors), collaborators - Git archaeology for the why:
git log --follow,git log -S<symbol>,git blame, full commit messages of formative commits,gh pr viewwhen commits reference PRs — extract stated motivations; degrade gracefully withoutgh - Use
$PROJECT_ROOTfor all git commands; fall back togit rev-parse --show-toplevel - Build the explainer from the section library by question type: conclusion card (always), call-chain/data-flow SVG (flow, bug), evolution timeline (design rationale), why-chain symptom→proximate→root (bug), component map (module/onboarding), evidence in default-collapsed
<details>(always) - Read the HTML template at the path given in the prompt before writing; calibrate prose to the given audience (free-form string, default developer)
- Write to
$PROJECT_ROOT/explain-<slug>-<YYYY-MM-DD>.html; terminal output is one paragraph of conclusion plus the file path
Constraints
- HTML makes zero external requests — inline SVG only, no Mermaid/CDN;
prefers-color-schemedark/light - Cite commits by short hash; never invent history — say when archaeology is inconclusive
- No raw diffs or whole-file dumps — excerpt only what supports the explanation
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.
- yesterday First seen · 55 lines · 0 tokens per session scan A 087bf3db7637
explain-agent is an agent published in the GitHub repository shdennlin/agent-plugins (2 stars, last pushed 7d ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 608 tokens. 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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