What is cerul-plugin?

A plugin for searching indexed media and answering questions with cited evidence. Indexed media means content that has been collected and made searchable.

Use it to find information in indexed media and produce answers that show where the evidence came from.

It helps replace unsupported answers with claims tied to evidence from the searched media.

cerul-plugin — Plugin by cerul-ai

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 plugins/cerul-ai/cerul/marketplace

Claude Code

/plugin marketplace add cerul-ai/cerul

Clone the repo

git clone --depth 1 https://github.com/cerul-ai/cerul

Made for: Claude Code.

Per session not measured What this adds to a session before it is invoked.

When invoked not measured Not applicable: nothing here is loaded into a session.

Security scan A 0 findings. Scan, not verified.

Origin original No closer match found in the catalogue.

Security

Grade A, and why

cerul-plugin 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 yesterday.

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-plugin/marketplace.json · 19 lines

What it actually says

{
  "name": "cerul-plugin",
  "owner": {
    "name": "Cerul AI"
  },
  "metadata": {
    "description": "Cerul public integration for grounded media evidence.",
    "version": "1.0.0"
  },
  "plugins": [
    {
      "name": "cerul",
      "description": "Search and answer with cited evidence from indexed media.",
      "version": "1.0.0",
      "source": "./integrations/claude-code/plugins/cerul"
    }
  ]
}

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.

yesterday First seen · 19 lines scan A 0bb49d109095

Subscribe to this mod's changes

cerul-plugin is a plugin published in the GitHub repository cerul-ai/cerul (156 stars, last pushed 2d ago), licensed Apache-2.0. 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 2026-08-30.

Backend and APIs Databases Multimodal Writing and docs ai-agent api computer-vision neon-postgres pgvectorscale

cerul-plugin

Getting it into your agent

Grade A, and why

Nothing flagged

What it actually says

What this file has done since we first saw it

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