overreliance

A security check for software that treats an AI language model’s answer as a confirmed fact or decision. It focuses on cases where no person or separate check reviews the answer.

In plain words
What is it for?
Use it when showing model answers as advice, letting a model approve merges or deployments, or sending its decisions into automated workflows. It helps identify missing confidence checks, domain checks, and fallback paths.
Why use it?
AI models can sound certain while being wrong or out of date. In medical, legal, financial, or deployment systems, acting on an unchecked answer can cause serious harm.

Skill for Claude CodeCodex

Part of the soundcheck plugin — 50 skills, 7 agents, 2 hooks 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 skills/thejefflarson/soundcheck/overreliance
Any agent
npx skills add thejefflarson/soundcheck --skill overreliance
Clone the repo
git clone --depth 1 https://github.com/thejefflarson/soundcheck

Made for: Claude Code, Codex.

Or install soundcheck, the plugin that ships this one along with the rest of its 50 skills, 7 agents, 2 hooks.

Per session 60 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 807 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 $0.00060 $0.00807
Opus 5 $0.00030 $0.00404
Sonnet 5 $0.00012 $0.00161
Haiku 4.5 $0.00006 $0.00081

Measured 3d ago against content hash 41bdb5c1c50a, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

overreliance 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 3d 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.

.claude/skills/overreliance/SKILL.md · 64 lines

How it starts

The opening of the file, as written. The whole thing — 64 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Overreliance on LLM Output (OWASP LLM09:2025)

What this checks

Prevents systems from treating LLM output as ground truth. LLMs hallucinate, produce confident-sounding errors, and lack real-time knowledge. Acting on unverified output in medical, legal, financial, or deployment contexts can cause serious harm.

Vulnerable patterns

  • LLM diagnosis, legal advice, or financial guidance displayed in the UI with no caveat or disclaimer.
  • Automated pipeline that merges, deploys, or publishes based solely on an LLM approval signal.
  • Confidence threshold defined as a constant but never used to branch behavior — every non-null response is accepted.
  • High-stakes domain list defined but never compared against the current request before action.
  • No alternate path when the LLM output fails a sanity check or confidence threshold.

Fix immediately

Flag the vulnerable code and explain the risk. Then suggest a fix that establishes these properties. Translate each property into the audited file's language and framework — apply the principles with whatever conditional, logging, and routing primitives the host stack provides.

  1. Gate on confidence and domain, and the gate must branch. Defining a confidence threshold or a high-stakes domain set without a conditional that actually diverges behavior (review queue versus direct return, proceed versus halt) is the exact bug this skill prevents. The failing branch routes to human review; the passing branch attaches a disclaimer and returns.
  2. No raw model output reaches the caller. Every return site wraps the content with an "AI-generated — verify before acting" disclaimer or equivalent marker.
  3. Irreversible actions (merge, deploy, payment, publish) require a human trigger — they are never invoked from the function that consumes the LLM result.
  4. The audit log captures enough context to reconstruct the decision: the inputs the LLM saw, the output it produced, and the confidence signal. Metadata alone (request id, timestamp, domain) is insufficient — a reviewer cannot second-guess a decision they cannot re-read.

Read the full file on GitHub · 64 lines

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. 3d ago First seen · 64 lines · 60 tokens per session scan A 41bdb5c1c50a

Subscribe to this mod's changes

overreliance is a skill published in the GitHub repository thejefflarson/soundcheck (20 stars, last pushed 1mo ago), licensed MIT. It adds 60 tokens to every session and 807 once invoked, about $0.0003 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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