reason

reason is a command for coding agents from dhruv-corethink/reasoning-traces. It costs 8 tokens per session (101 once invoked), scanned A, original, MIT.

A command named /reason that sends a problem and relevant code or errors to the Reasoning Traces oracle, which is a separate reasoning model.

In plain words
What is it for?
Investigating bugs, architecture questions, algorithm design, or other problems where the agent needs multi-step reasoning.
Why use it?
It provides a repeatable way to get additional analysis for a difficult problem and then check that analysis against the actual code.

Command

Part of the reasoning-traces plugin — 1 command, 1 MCP server shipped together

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 commands/dhruv-corethink/reasoning-traces/reason
Clone the repo
git clone --depth 1 https://github.com/dhruv-corethink/reasoning-traces

Or install reasoning-traces, the plugin that ships this one along with the rest of its 1 command, 1 MCP server.

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 reason

README.md
[![agentmods](https://agentmods.dev/badge/commands/dhruv-corethink/reasoning-traces/reason.svg)](https://agentmods.dev/commands/dhruv-corethink/reasoning-traces/reason)
Your own site
<a href="https://agentmods.dev/commands/dhruv-corethink/reasoning-traces/reason"><img src="https://agentmods.dev/badge/commands/dhruv-corethink/reasoning-traces/reason.svg" alt="Measured on agentmods" height="20"></a>
Per session 8 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 101 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 $0.00008 $0.00101
Opus 5 $0.00004 $0.00051
Sonnet 5 $0.00002 $0.00020
Haiku 4.5 $0.00001 $0.00010

Measured 3d ago against content hash be2f378617bd, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

reason 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 3d 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.

commands/reason.md · 11 lines

What it actually says

Consult the Reasoning Traces oracle on the following problem:

$ARGUMENTS

  1. Gather any files, code, or error output relevant to the problem.
  2. Call the deep_reasoning tool (from the reasoning-traces MCP server) with the problem and that context.
  3. Read the reasoning trace, verify it against the actual code, and present your conclusion — note any points where you disagree with the trace.
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. 3d ago First seen · 11 lines · 8 tokens per session scan A be2f378617bd

Subscribe to this mod's changes

reason is a command published in the GitHub repository dhruv-corethink/reasoning-traces (0 stars, last pushed 1mo ago), licensed MIT. It adds 8 tokens to every session and 101 once invoked, about $0.0000 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.