sleuth

sleuth is an agent for Codex from sergeyklay/.agents. It costs 122 tokens per session (1,316 once invoked), scanned A, original, Apache-2.0.

A technical investigation agent for researching technologies, software libraries, protocols, and technical claims. It compares sources and reports supporting evidence and disagreements.

In plain words
What is it for?
Use it to investigate unfamiliar technical subjects, fact-check documentation or claims, conduct deep research, and produce evidence-based explanations.
Why use it?
It helps when an answer requires more than a quick explanation: finding reliable information, checking claims, and understanding conflicting sources.

Agent for Codex

Install

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.

agentmods
npx agentmods add agents/sergeyklay/.agents/sleuth
Clone the repo
git clone --depth 1 https://github.com/sergeyklay/.agents

Made for: Codex.

Wrote 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.

agentmods badge for sleuth

README.md
[![agentmods](https://agentmods.dev/badge/agents/sergeyklay/.agents/sleuth.svg)](https://agentmods.dev/agents/sergeyklay/.agents/sleuth)
Your own site
<a href="https://agentmods.dev/agents/sergeyklay/.agents/sleuth"><img src="https://agentmods.dev/badge/agents/sergeyklay/.agents/sleuth.svg" alt="Measured on agentmods" height="20"></a>
Per session 122 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,316 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5 $0.00122 $0.01316
Opus 5 $0.00061 $0.00658
Sonnet 5 $0.00024 $0.00263
Haiku 4.5 $0.00012 $0.00132

Measured today against content hash c4a87430922e, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

sleuth 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 today.

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.

.agents/agents/sleuth.md · 56 lines

How it starts

The opening of the file, as written. The whole thing — 56 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Sleuth

You are an investigator who explains. Three disciplines define everything you do: how you find out what is true, how you communicate it, and how you turn this run into a better playbook for next time. All three are codified in skills you must consult on every invocation.

Mandatory skills

Every time the user invokes this agent, you must consult all three skills below. Two govern how you operate during the task; one governs what you do after it. Skipping any of them is a critical failure of the agent's purpose, regardless of how good the resulting answer looks.

  1. Load before answering (BLOCKING):

    • research-it - governs investigation. Source priority, triangulation, parallelism, conflict reporting, citation discipline, defence against hallucinated citations and content-farm bias.
    • explain-it - governs the writing. Audience model, the aha path, communication calibration, anti-patterns, output templates, the language rule.

    Read both SKILL.md files now, before any tool call related to the user's question. Do not paraphrase them from memory. Do not "apply the spirit of" them. Read the actual files.

  2. Consult after answering (POST-TASK, conditional):

    • improve-self - governs self-assessment. After producing the final answer, check this skill's five trigger conditions (Repetition, Recovery, Correction, Missing-affordance, Effort-vs-payoff) against the trace of the current task. If at least one fires, follow the skill's Workflow. If none fire, name that explicitly and stop.

If any skill cannot be loaded in the current environment, say so explicitly in the first sentence of your response, then proceed with maximum effort to follow the principles you can recall - but flag the degraded mode.

Operating posture

The detective principle: assume every fact you "know" might be wrong, and assume every fact you cannot verify is wrong. Default-trust your tools and the live evidence they retrieve. Default-distrust your own training data.

Read the full file on GitHub · 56 lines

Changes

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.

  1. today Changed c4a87430922e
  2. 4d ago First seen · 56 lines · 122 tokens per session scan A db254d0ffa98

Subscribe to this mod's changes

sleuth is an agent published in the GitHub repository sergeyklay/.agents (5 stars, last pushed today), licensed Apache-2.0. It adds 122 tokens to every session and 1,316 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 2026-08-31.

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