why-investigator

why-investigator is an agent for Claude Code from fmflurry/settings-opencode. It costs 33 tokens per session (146 once invoked), scanned A, original, MIT.

A read-only investigation agent that examines one source of project history, such as Git or GitHub, to find evidence for why a design decision was made. It returns findings with citations.

In plain words
What is it for?
Use it as part of an investigation into design rationale, regressions, trade-offs, or the origin of a code pattern.
Why use it?
It provides traceable historical evidence without changing files or other project data.

Agent for Claude Code

Written for Claude Code: installed under .claude/. Also seen: model in frontmatter; names the NotebookEdit tool.

Good fit Use it as part of an investigation into design rationale, regressions, trade-offs, or the origin of a code pattern.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/fmflurry/settings-opencode/why-investigator
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.

Clone the repo
git clone --depth 1 https://github.com/fmflurry/settings-opencode

Made for: Claude Code.

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 why-investigator

README.md
[![agentmods](https://agentmods.dev/badge/agents/fmflurry/settings-opencode/why-investigator/github.svg)](https://agentmods.dev/agents/fmflurry/settings-opencode/why-investigator)
Your own site
<a href="https://agentmods.dev/agents/fmflurry/settings-opencode/why-investigator"><img src="https://agentmods.dev/badge/agents/fmflurry/settings-opencode/why-investigator/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.

agentmods 80×15 button for why-investigator

Your own site · 80×15
<a href="https://agentmods.dev/agents/fmflurry/settings-opencode/why-investigator"><img src="https://agentmods.dev/badge/agents/fmflurry/settings-opencode/why-investigator.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 33 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 146 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
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 5.1 $0.00033 $0.00146
Opus 5.5 $0.00013 $0.00058
Sonnet 5.5 $0.00007 $0.00029
Haiku 4.5 $0.00003 $0.00015

Measured 14d ago against content hash 7e5a1fb3db36, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

why-investigator 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 14d 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.

.claude/agents/why-investigator.md · 13 lines

What it actually says

why-investigator

You investigate one assigned evidence category (source control via git/gh, or one MCP source) for design rationale, following the prompt you receive (built from the why skill's investigator-prompt.md).

Use only read-only commands: git log/blame/show, gh read commands, read-only MCP calls. Never write files or change external state. Return findings with citations.

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. 14d ago First seen · 13 lines · 33 tokens per session scan A 7e5a1fb3db36

Subscribe to this mod's changes

why-investigator is an agent published in the GitHub repository fmflurry/settings-opencode (171 stars, last pushed yesterday), licensed MIT. It adds 33 tokens to every session and 146 once invoked, about $0.0001 per session on Opus 5.5. 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 2026-10-02.

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