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empirica

empirica is a plugin for Claude Code from obzenner/siffran. Its manifest loads nothing; the 1 skill, 1 command, 1 agent, 9 hooks, 1 MCP server it bundles cost 133 tokens per session together, scanned A, original, no licence file.

An evidence-checking workflow for claims arranged in a structured argument. It requires outside research, machine-checkable tests where possible, and a separate review before accepting the result.

In plain words
What is it for?
Use it to verify research-based statements, test technical claims with deterministic experiments, and audit the evidence behind a connected argument.
Why use it?
It prevents claims from being treated as reliable without supporting evidence and independent checking.

Plugin for Claude Code

Written for Claude Code: a Claude Code plugin manifest.

not rated 7repo changed 2d ago A scan tokens not measured custom licence

Good fit Use it to verify research-based statements, test technical claims with deterministic experiments, and audit the evidence behind a connected argument.

Compare 6 plugins from other repositories ↓
Install in Claude Code
/plugin marketplace add obzenner/siffran
/plugin install empirica
View source ↗ obzenner/siffran
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/obzenner/siffran

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 empirica

README.md
[![agentmods](https://agentmods.dev/badge/plugins/obzenner/siffran/empirica/github.svg)](https://agentmods.dev/plugins/obzenner/siffran/empirica)
Your own site
<a href="https://agentmods.dev/plugins/obzenner/siffran/empirica"><img src="https://agentmods.dev/badge/plugins/obzenner/siffran/empirica/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 empirica

Your own site · 80×15
<a href="https://agentmods.dev/plugins/obzenner/siffran/empirica"><img src="https://agentmods.dev/badge/plugins/obzenner/siffran/empirica.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session not measured What this adds to a session before it is invoked.
When invoked not measured The manifest loads nothing itself; its 1 skill, 1 command, 1 agent, 9 hooks, 1 MCP server cost 133 tokens a session between them.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin unknown No closer match found in the catalogue.
Security

Grade A, and why

empirica 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 2d 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.

plugins/empirica/.claude-plugin/plugin.json · 10 lines

The source is not reproduced here

A licence we could not identify

The repository carries a LICENSE file, but it is custom or dual enough that GitHub cannot name it and neither can this catalogue. Unknown terms are not permission, so the body is not copied here. Read the licence at the source and decide for yourself.

Read it on GitHub

Contents

What it installs

The manifest is a name and a version. 1 skill, 1 command, 1 agent, 9 hooks, 1 MCP server travel with it, and installing the plugin installs all of them — 133 tokens a session between them. Each is measured on its own page, and each can be installed alone.

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. 2d ago Changed 252b0e229ec5
  2. 5d ago Changed 8781821e8d3f
  3. 9d ago Changed 8d5ee836513b
  4. 23d ago Changed · +1 lines c03ec4afeba0
  5. 1mo ago Changed 12e60e519f70
  6. 1mo ago Changed 5c47974bbfc2
  7. 1mo ago Changed 76fd757ad995
  8. 1mo ago Changed 1060525d2251
  9. 1mo ago Changed 943c96b11427
  10. 1mo ago First seen · 9 lines scan A 65e1f03da846

Subscribe to this mod's changes

empirica is a plugin published in the GitHub repository obzenner/siffran (7 stars, last pushed 3d ago), with no licence file. Its token cost is not measured: this kind of file is read by the harness, not the model. 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.

Research
Related

empirica compared with plugins from other repositories

empirica next to 6 plugins from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
empiricaobzenner/siffranPlugin73d agononeA—Claude Code
humanizerblader/humanizerPlugin66k11d agoMITA—Claude Code
claude-plugins-official marketplaceanthropics/claude-plugins-officialPlugin46kyesterdayApache-2.0A—Claude Code
themes-examplegoogle-gemini/gemini-cliPlugin109ktodayApache-2.0A—Gemini CLI
nextjsvercel/next.jsPlugin143ktodayMITA—Claude Code
knowledge-work-plugins marketplaceanthropics/knowledge-work-pluginsPlugin35kyesterdayApache-2.0A—Claude Code
code-modernizationanthropics/claude-plugins-officialPlugin46kyesterdayApache-2.0A—Claude Code