fail-unknown-key

fail-unknown-key is an agent for coding agents from gmickel/flow-next. It costs 18 tokens per session (42 once invoked), scanned A, original, MIT.

A test fixture containing an unsupported configuration field.

In plain words
What is it for?
Testing frontmatter or agent-configuration validation.
Why use it?
It helps check that unknown settings are rejected instead of being accepted without a defined meaning.

Agent

Part of the flow-next plugin — 33 skills, 30 commands, 25 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/gmickel/flow-next/fail-unknown-key
Clone the repo
git clone --depth 1 https://github.com/gmickel/flow-next

Or install flow-next, the plugin that ships this one along with the rest of its 33 skills, 30 commands, 25 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 fail-unknown-key

README.md
[![agentmods](https://agentmods.dev/badge/agents/gmickel/flow-next/fail-unknown-key.svg)](https://agentmods.dev/agents/gmickel/flow-next/fail-unknown-key)
Your own site
<a href="https://agentmods.dev/agents/gmickel/flow-next/fail-unknown-key"><img src="https://agentmods.dev/badge/agents/gmickel/flow-next/fail-unknown-key.svg" alt="Measured on agentmods" height="20"></a>
Per session 18 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 42 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 $0.00018 $0.00042
Opus 5 $0.00009 $0.00021
Sonnet 5 $0.00004 $0.00008
Haiku 4.5 $0.00002 $0.00004

Measured yesterday against content hash 89c07a22d746, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

fail-unknown-key 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.

plugins/flow-next/tests/fixtures/opencode-install/agents/fail-unknown-key.md · 9 lines

What it actually says

Body text.

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. yesterday First seen · 9 lines · 18 tokens per session scan A 89c07a22d746

Subscribe to this mod's changes

fail-unknown-key is an agent published in the GitHub repository gmickel/flow-next (691 stars, last pushed today), licensed MIT. It adds 18 tokens to every session and 42 once invoked, about $0.0001 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 2026-09-03.

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