fnox is a secret manager that stores credentials either encrypted in a Git repository or in supported cloud and password-management services. Developers use it to provide secrets to commands and shell sessions across development, continuous integration, and production. The catalogue includes instructions for using fnox.
Borrowing it
Nothing to install: this file belongs to jdx/fnox. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/jdx/fnox/main/AGENTS.mdgit clone --depth 1 https://github.com/jdx/fnoxWrote 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.
[](https://agentmods.dev/instructions/jdx/fnox/agents-md)<a href="https://agentmods.dev/instructions/jdx/fnox/agents-md"><img src="https://agentmods.dev/badge/instructions/jdx/fnox/agents-md/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/instructions/jdx/fnox/agents-md"><img src="https://agentmods.dev/badge/instructions/jdx/fnox/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.02657 | $0.02657 |
| Opus 5.5 | $0.01063 | $0.01063 |
| Sonnet 5.5 | $0.00531 | $0.00531 |
| Haiku 4.5 | $0.00266 | $0.00266 |
Grade A, and why
fnox AGENTS.md 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.
How it starts
The opening of the file, as written. The whole thing — 189 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Fnox Development Guide
Conventional Commits
PR titles must use <type>[optional scope][optional !]: <description>. Intermediate commit
subjects should use the same format. Start the description with a lowercase
character or an acronym such as CLI, and use imperative mood.
Types: feat, fix, refactor, docs, style, perf, test, chore, ci, revert, security
Scopes: command names (get, set, exec, list, provider), provider names (age, 1password, bitwarden, bitwarden-sm, aws-kms, aws-sm, aws-ps, keychain, keepass, infisical, passwordstate, pass, proton-pass), subsystems (config, encryption, env, deps)
Examples: fix(aws-sm): handle pagination for large secret lists, feat(exec): add --no-inherit flag
CI validates the pull request title and re-runs when it is edited. Intermediate commit subjects are not checked because pull requests are squash-merged. CI mechanically checks the allowed type, syntax, and lowercase- or acronym-leading description; imperative mood remains a review rule.
Minimum Supported Rust Version (MSRV)
rust-version in the workspace Cargo.toml is kept behind the latest stable
Rust on purpose. fnox is built from source by packagers that provide their own,
often older, rustc — Linux distro packages (cargo install against a
distro-provided toolchain) and nixpkgs (one shared, conservative rustc for the
whole tree). Raising the MSRV can make fnox unbuildable there.
Do not raise the MSRV to satisfy a dependency. If a dependency bump requires
a newer rustc than our declared MSRV (the msrv CI job, cargo msrv verify,
will fail), pin that dependency to its last MSRV-compatible version instead.
.cargo/config.toml sets resolver.incompatible-rust-versions = "fallback" so
cargo update/cargo add prefer MSRV-compatible versions automatically.
Dependency Updates
- Use the lowest compatibility-significant specificity in
Cargo.toml(for example,"1"for stable 1.x dependencies). - When the existing manifest requirement accepts a routine dependency update, change only
Cargo.lock. - Keep lockfile updates focused and avoid unrelated transitive dependency churn.
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 Changed · -16 lines · -782 tokens per session 2c6eb2123267
- 18d ago Changed · +1 lines · +32 tokens per session ac71c646f57e
- 21d ago Changed · +1 lines · +30 tokens per session 034f432f3b51
- 28d ago Changed · +1 lines · +40 tokens per session 486809cbfc0b
- 1mo ago Changed · +16 lines · +784 tokens per session 5f06962bf945
- 1mo ago Changed · +21 tokens per session e2b8ca260a5f
- 1mo ago Changed · -14 lines · -203 tokens per session dc847acd6add
- 1mo ago Changed · +41 lines · +575 tokens per session 26bb0611db4d
- 1mo ago Changed · +2 lines · +15 tokens per session 18c185effe79
- 1mo ago First seen · 157 lines · 2,145 tokens per session scan A 217501312079
fnox AGENTS.md is an instructions file published in the GitHub repository jdx/fnox (2,355 stars, last pushed today), licensed MIT. It adds 2,657 tokens to every session, about $0.0106 per session on Opus 5.5. 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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