investigate

investigate is a skill for Claude Code from SebastianElvis/reaper. It costs 43 tokens per session (4,729 once invoked), scanned A, original, Apache-2.0.

A research-testing tool that examines hypotheses through proof checking, counterexample searches, or security analysis. A counterexample is a specific case that disproves a claim.

In plain words
What is it for?
Use it to investigate, verify, prove, or disprove claims over several testing cycles.
Why use it?
It provides a repeatable way to test research ideas and discard those that do not survive evidence.

Skill for Claude Code

Written for Claude Code: user-invocable in frontmatter. Also seen: mentions subagents; mentions Claude Code.

Part of the reaper plugin — 10 skills shipped together

Good fit Use it to investigate, verify, prove, or disprove claims over several testing cycles.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/sebastianelvis/reaper/investigate
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.

Any agent
npx skills add SebastianElvis/reaper --skill investigate
Clone the repo
git clone --depth 1 https://github.com/SebastianElvis/reaper

Made for: Claude Code.

Or install reaper, the plugin that ships this one along with the rest of its 10 skills.

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 investigate

README.md
[![agentmods](https://agentmods.dev/badge/skills/sebastianelvis/reaper/investigate/github.svg)](https://agentmods.dev/skills/sebastianelvis/reaper/investigate)
Your own site
<a href="https://agentmods.dev/skills/sebastianelvis/reaper/investigate"><img src="https://agentmods.dev/badge/skills/sebastianelvis/reaper/investigate/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 investigate

Your own site · 80×15
<a href="https://agentmods.dev/skills/sebastianelvis/reaper/investigate"><img src="https://agentmods.dev/badge/skills/sebastianelvis/reaper/investigate.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 43 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 4,729 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 $0.00043 $0.04729
Opus 5 $0.00022 $0.02364
Sonnet 5 $0.00009 $0.00946
Haiku 4.5 $0.00004 $0.00473

Measured 11d ago against content hash b8c583c2879d, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

investigate 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 11d 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.

skills/investigate/SKILL.md · 308 lines

How it starts

The opening of the file, as written. The whole thing — 308 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Investigate

The core research loop. Run N investigation cycles, each testing a hypothesis and applying keep-or-discard discipline.

Usage

Invoke this skill by name with an optional cycle count. On slash-command hosts, prefix with / (e.g. /investigate 10).

# Run 10 investigation cycles
investigate 10

# Default: 5 cycles
investigate

Default: 5 cycles if no argument given.

Inputs

Always read before starting:

  • reaper-workspace/notes/problem-statement.md — model assumptions and property definitions
  • reaper-workspace/notes/ideas.md — the ideas to investigate
  • reaper-workspace/notes/current-understanding.md — the "branch tip" of accumulated knowledge
  • reaper-workspace/notes/results.md — what's been tried and what happened

Lazy-load only when needed (do not read upfront — load only if a cycle's hypothesis requires it or the "when stuck" protocol calls for it):

  • reaper-workspace/notes/paper-summary.md — the source paper (if provided)
  • reaper-workspace/notes/literature.md — known prior work (organized by same-goal and same-approach)
  • reaper-workspace/papers/ — downloaded PDFs and per-paper notes (<id>-notes.md) from the literature review
  • ../reaper/references/methodology.md — proof/analysis patterns

The Batch Loop

Investigation runs in batches, not sequential cycles. Independent hypotheses are investigated in parallel by default; sequential execution is the fallback when dependencies exist.

Overview: Plan → Dispatch → Merge → Repeat

while cycles_remaining > 0 and not converged:
    Plan:     read ideas.md + notes/results.md → dependency graph → batch of independent hypotheses
    Dispatch: spawn one subagent per hypothesis (parallel, in one message)
    Merge:    collect results → update notes/results.md → integrate "keep" insights into current-understanding.md

Plan Batch

  1. Read ideas.md and notes/results.md
  2. Identify all unresolved hypotheses. Check notes/results.md to avoid repeating failed approaches.
  3. Build a dependency graph: does resolving H2 require knowing the outcome of H1? If so, H2 depends on H1.
  4. Select the largest set of independent hypotheses that can run concurrently. Cap the batch size at cycles_remaining.
  5. Allocate cycle numbers: pre-assign a contiguous range per subagent (e.g., batch 1 gets 001-003, batch 2 gets 004-006). Each subagent gets one or more consecutive numbers from its range.
  6. If all remaining hypotheses form a dependency chain, the batch size is 1 — this is the sequential fallback (see below).
  7. If all hypotheses are resolved, stop and return control to the orchestrator. The orchestrator will call /brainstorm to generate new ideas if needed.

Read the full file on GitHub · 308 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. 11d ago First seen · 308 lines · 43 tokens per session scan A b8c583c2879d

Subscribe to this mod's changes

investigate is a skill published in the GitHub repository SebastianElvis/reaper (9 stars, last pushed 4mo ago), licensed Apache-2.0. It adds 43 tokens to every session and 4,729 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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