evidence-gate

evidence-gate is an agent for Claude Code from smshahbaj/crucible. It costs 31 tokens per session (165 once invoked), scanned A, original, MIT.

A review step that checks the claims most likely to affect a decision and labels their evidence as verified, supported, unverified, or speculative. It also identifies the most important claim to check next.

In plain words
What is it for?
Use it before a major synthesis or decision review to list critical claims, assess their impact, choose the cheapest way to verify them, and define when to stop reviewing.
Why use it?
It helps prevent expensive analysis from relying on weak or untested assumptions.

Agent for Claude Code

Written for Claude Code: effort in frontmatter. Also seen: model in frontmatter.

Part of the crucible plugin — 1 skill, 1 command, 14 agents shipped together

Good fit Use it before a major synthesis or decision review to list critical claims, assess their impact, choose the cheapest way to verify them, and define when to stop reviewing.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/smshahbaj/crucible/evidence-gate
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/smshahbaj/crucible

Made for: Claude Code.

Or install crucible, the plugin that ships this one along with the rest of its 1 skill, 1 command, 14 agents.

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 evidence-gate

README.md
[![agentmods](https://agentmods.dev/badge/agents/smshahbaj/crucible/evidence-gate/github.svg)](https://agentmods.dev/agents/smshahbaj/crucible/evidence-gate)
Your own site
<a href="https://agentmods.dev/agents/smshahbaj/crucible/evidence-gate"><img src="https://agentmods.dev/badge/agents/smshahbaj/crucible/evidence-gate/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 evidence-gate

Your own site · 80×15
<a href="https://agentmods.dev/agents/smshahbaj/crucible/evidence-gate"><img src="https://agentmods.dev/badge/agents/smshahbaj/crucible/evidence-gate.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 31 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 165 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 $0.00031 $0.00165
Opus 5 $0.00015 $0.00082
Sonnet 5 $0.00006 $0.00033
Haiku 4.5 $0.00003 $0.00016

Measured 8d ago against content hash 863724c5ce4b, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

evidence-gate 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 8d 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.

agents/evidence-gate.md · 28 lines

What it actually says

You are the Evidence Gate.

Do not solve the decision. Classify only the claims that can change the decision.

Return: CRITICAL CLAIMS:

  • [claim] | VERIFIED / SUPPORTED / UNVERIFIED / SPECULATIVE | impact HIGH/MEDIUM/LOW

BLOCKER:

  • The single claim that most needs verification, or NONE.

CHEAPEST RESOLUTION:

  • direct check / calculation / source / experiment / specialist / none

STOP CONDITION:

  • What would make further review unnecessary?

Never invent evidence.

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. 8d ago First seen · 28 lines · 31 tokens per session scan A 863724c5ce4b

Subscribe to this mod's changes

evidence-gate is an agent published in the GitHub repository smshahbaj/crucible (9 stars, last pushed 15d ago), licensed MIT. It adds 31 tokens to every session and 165 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.