prismor 1.17.5

Runtime security for AI coding agents: policy enforcement, secret prevention, and supply-chain blocking.

Prismor

formerly Immunity Agent

Runtime security for AI coding agents. Policy enforcement, secret prevention, supply-chain blocking, and session auditing — all running locally on your machine.

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What it does

AI coding agents execute shell commands, read files, call APIs, and install packages autonomously. Prismor sits between the agent and the operating system to:

• Block dangerous actions before they run — destructive commands, privilege escalation, reverse shells, secret exfiltration
• Intercept package installs and score them for supply-chain risk before they touch your disk
• Prevent secrets from reaching the model — register a secret under a placeholder name; the hook substitutes the real value at execution time
• Log every tool call to a local SQLite store for session review and auditing

Supports Claude Code, Cursor, Windsurf, and more.

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Install

pip install prismor

Requires Python ≥ 3.8 and PyYAML (installed automatically).

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Quick start

Install Prismor hooks into your project (enforces policy on every agent tool call):

prismor install-hooks --agent claude --workspace . --mode observe

Start in observe mode to log would-be blocks without interrupting the agent. Switch to enforce when ready:

prismor install-hooks --agent claude --workspace . --mode enforce

Wrap your package manager to score installs before they run:

prismor supplychain npm install express
prismor supplychain pip install requests
prismor supplychain cargo add serde

Check a command against policy before running it:

prismor check "rm -rf /"
# BLOCK  destructive_command  CRITICAL

Audit your workspace security posture:

prismor audit

Scan AI tool configs for leaked secrets:

prismor sweep

Launch the self-hosted dashboard (reads from local SQLite, no cloud):

prismor dashboard   # opens http://127.0.0.1:7070 in your browser

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Detection coverage

Prismor ships with 56 rules covering the OWASP Top 10 for LLM Applications:

Category	Severity	What it catches
Destructive command	CRITICAL	rm -rf /, mkfs, dd to disk
Secret exfiltration	CRITICAL	cat .env | curl, piping credentials outbound
RCE canary	CRITICAL	Reverse shells, bash -i /dev/tcp
Privilege escalation	CRITICAL	chmod +s, sudoers edits, useradd
Remote execution	HIGH	curl | bash, wget | sh
Secret access	HIGH	Reads of .env, .aws/credentials, .ssh/id_rsa
Path traversal	HIGH	../../etc/passwd, /proc/self/environ
DB modification	HIGH	DROP TABLE, DELETE FROM in shell commands
Prompt injection	HIGH	ignore instructions, reveal system prompt
Risky write	MEDIUM	Edits to Dockerfile, CI workflows, package.json

Rules are defined in YAML and fully customizable per-project.

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Supply chain enforcement

The prismor CLI wraps your package manager and evaluates every install against live threat intelligence before it runs. Packages are scored on age, maintainer count, install scripts, and known IOCs. Ships with IOC coverage for recent attacks including the AntV hijacked-maintainer attack (May 2026) and the mini-shai-hulud campaign (May 2026).

prismor supplychain npm install @tanstack/react-router
  BLOCK  score 100  @tanstack/react-router
         42 @tanstack/* packages compromised via CI/CD cache poisoning

Verdicts: < 30 allow · 30–59 warn · ≥ 60 block. IOC matches always block.

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Secret cloaking

Register a secret under a placeholder name:

prismor cloak add stripe_key
# prompts for the value — never stored in shell history
prismor cloak add --env-file .env
# imports each KEY=VALUE entry as @@SECRET:KEY@@

Reference it in agent instructions:

Run: curl https://api.stripe.com -H "Authorization: Bearer @@SECRET:stripe_key@@"

The pre-tool-use hook substitutes the real value at execution time. The post-tool-use hook scrubs any echoed value from output before it returns to the model.

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Modes

Mode	Behaviour
observe	Logs all findings, never blocks. Good for the first 24–48 h on a new workspace.
enforce	Blocks dangerous actions in real time before the agent executes them.

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Links

• Repository: https://github.com/PrismorSec/prismor
• Docs: https://docs.prismor.dev
• Dashboard: https://prismor.dev