hallucination-guard

hallucination-guard is an agent for coding agents from Rune-kit/rune. It costs 35 tokens per session (263 once invoked), scanned A, original, MIT.

A check for code-generation mistakes involving imports, functions, packages, and software-development kits. It verifies that referenced files, exported symbols, installed packages, and new package names actually exist.

In plain words
What is it for?
Use it after generating code to verify internal and external imports, check lockfiles and registries, detect suspicious package names, confirm SDK API signatures, and report verified results.
Why use it?
It helps prevent code from depending on made-up functions, missing files, unavailable packages, or lookalike package names used in typosquatting attacks.

Agent

Part of the rune plugin — 57 agents 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 agents/rune-kit/rune/hallucination-guard
Clone the repo
git clone --depth 1 https://github.com/Rune-kit/rune

Or install rune, the plugin that ships this one along with the rest of its 57 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 hallucination-guard

README.md
[![agentmods](https://agentmods.dev/badge/agents/rune-kit/rune/hallucination-guard.svg)](https://agentmods.dev/agents/rune-kit/rune/hallucination-guard)
Your own site
<a href="https://agentmods.dev/agents/rune-kit/rune/hallucination-guard"><img src="https://agentmods.dev/badge/agents/rune-kit/rune/hallucination-guard.svg" alt="Measured on agentmods" height="20"></a>
Per session 35 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 263 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 $0.00035 $0.00263
Opus 5 $0.00017 $0.00131
Sonnet 5 $0.00007 $0.00053
Haiku 4.5 $0.00003 $0.00026

Measured 4d ago against content hash 4bb53ee3afee, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

hallucination-guard 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 4d 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/hallucination-guard.md · 28 lines

What it actually says

You are the hallucination-guard skill — Rune's AI phantom code detector.

Quick Reference

Workflow:

  1. Extract all imports from changed files (separate internal vs external)
  2. Verify internal imports: file exists + exported symbol exists
  3. Verify external packages: in manifest + installed in lockfile
  4. Check for typosquatting: edit distance ≤2 from popular packages
  5. New packages MUST be verified against actual registry (npm/PyPI/crates.io)
  6. Verify API signatures via docs-seeker for new SDK calls
  7. Report: PASS / WARN / BLOCK with verified count

Critical Rules:

  • New packages MUST be verified against actual registry (hard gate)
  • Verify EVERY import — don't assume names are reasonable
  • Check specific exported symbol, not just file existence
  • Report verified count vs total (never say "no hallucinations" without evidence)

Read skills/hallucination-guard/SKILL.md for the full specification.

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. 4d ago First seen · 28 lines · 35 tokens per session scan A 4bb53ee3afee

Subscribe to this mod's changes

hallucination-guard is an agent published in the GitHub repository Rune-kit/rune (84 stars, last pushed 18d ago), licensed MIT. It adds 35 tokens to every session and 263 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 2026-08-30.

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