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/advancingtitans/agent-engineering-toolkit/aet-investigatenpx skills add AdvancingTitans/agent-engineering-toolkit --skill aet-investigategit clone --depth 1 https://github.com/AdvancingTitans/agent-engineering-toolkitWrote 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/advancingtitans/agent-engineering-toolkit/aet-investigate)<a href="https://agentmods.dev/skills/advancingtitans/agent-engineering-toolkit/aet-investigate"><img src="https://agentmods.dev/badge/skills/advancingtitans/agent-engineering-toolkit/aet-investigate.svg" alt="Measured on agentmods" 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 | $0.00044 | $0.00692 |
| Opus 5 | $0.00022 | $0.00346 |
| Sonnet 5 | $0.00009 | $0.00138 |
| Haiku 4.5 | $0.00004 | $0.00069 |
Grade B, and why
aet-investigate scanned grade B with 1 finding 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 5d 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.
Unrestricted tool accessmediumExcessive agency
A wildcard tool grant or "run any command" leaves no least-privilege boundary at all.
- Do not execute arbitrary commands, modify code, commit, push, merge, publish, or repair. How it starts
The opening of the file, as written. The whole thing — 80 lines — stays where its author put it; the contents beside it link to each section on GitHub.
/aet-investigate
Answer one declared investigation question with a portable evidence handoff.
Boundary
- Keep the target workspace read-only.
- Do not execute arbitrary commands, modify code, commit, push, merge, publish, or repair.
- Require one primary hypothesis, at least one competing hypothesis, and a disconfirming search.
- Treat Run Records as historical behavior. They may create Observations and
Evidence Candidates, but only explicit
proof.inspectandfreshness.checkresults may create Verified Evidence. - Preserve
unknown, counter-evidence, diagnostics, Freshness limitations, and everydoes_not_provestatement. - Use
policy.jsonandtool-contract.jsonwithout expanding their authority.
Workflow
-
Normalize one declared run when a normalized directory is not already available:
aet run normalize --source <codex|claude-code> \ --input <session.jsonl> --output <normalized-run> -
Create an
investigation-request/1.0JSON object. Bind itsrun_sourcesentry to the normalized Manifest'ssource_typeandrun_group_id. Copy the budgets and privacy boundary frompolicy.json; narrow them when possible. -
Run the investigator. Without a Proof it remains observation-only:
aet investigate --request <request.json> \ --run <normalized-run> --output <investigation.json>To inspect an existing deterministic Proof, the Policy must allow
proof.inspectandfreshness.check, and their budgets must be non-zero:aet investigate --request <request.json> \ --run <normalized-run> --workspace <workspace> \ --proof <proof.json> --output <investigation.json>The Proof path and its recorded workspace must remain inside and match the declared read-only workspace. A matching recorded command Candidate may be marked
verified; stale Proof remains historical Evidence and cannot answer a current-workspace Claim. -
Compile and validate the handoff:
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.
- 5d ago First seen · 80 lines · 44 tokens per session scan B 20df7278b297
aet-investigate is a skill published in the GitHub repository AdvancingTitans/agent-engineering-toolkit (2 stars, last pushed 28d ago), licensed MIT. It adds 44 tokens to every session and 692 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it B with 1 finding (unrestricted tool access). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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