caddy-security is a security application and set of plugins for Caddy v2, a web server, that handles user authentication and controls access to HTTP requests. It supports methods including local, LDAP, OpenID Connect, OAuth 2.0, SAML, JWT, and PASETO, and is used to protect web services behind Caddy.
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.
npx skills add greenpau/caddy-security --skill configuration-authentication-cookiesgit clone --depth 1 https://github.com/greenpau/caddy-securityWrote 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/skills/greenpau/caddy-security/configuration-authentication-cookies)<a href="https://agentmods.dev/skills/greenpau/caddy-security/configuration-authentication-cookies"><img src="https://agentmods.dev/badge/skills/greenpau/caddy-security/configuration-authentication-cookies/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/skills/greenpau/caddy-security/configuration-authentication-cookies"><img src="https://agentmods.dev/badge/skills/greenpau/caddy-security/configuration-authentication-cookies.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 | $0.00034 | $0.03735 |
| Opus 5.5 | $0.00014 | $0.01494 |
| Sonnet 5.5 | $0.00007 | $0.00747 |
| Haiku 4.5 | $0.00003 | $0.00374 |
Grade A, and why
configuration-authentication-cookies 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 today.
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 — 359 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Configuration Authentication Cookies
Contract and Sources
Portal cookie statements are collected in caddyfile_authn.go. The thin
translation in caddyfile_authn_cookie.go preserves legacy Caddy spellings;
pkg/authn/cookie/parser.NewCookieConfigFromDirectives in the AuthCrunch version selected by go.mod owns grammar, normalization, duplicates, and validation.
PortalConfig.ConfigureCookies installs one complete validated snapshot.
It replaces previous cookie settings, rather than merging individual lines.
Portal construction wires the final access name into its grantor and validator.
Portal wiring belongs to configuration-authentication and policy behavior to configuration-authorization. Upstream source is read-only.
Set Every Default Name with One Prefix
authentication portal myportal {
enable identity store localdb
set cookie name prefix PORTAL
}
That one statement covers all ten roles:
| Role | Effective cookie name |
|---|---|
| Session ID | PORTAL_SESSION_ID |
| Referer/redirect URL | PORTAL_REDIRECT_URL |
| Sandbox ID | PORTAL_SANDBOX_ID |
| Identity token | PORTAL_ID_TOKEN |
| Access token | PORTAL_ACCESS_TOKEN |
| Refresh token | PORTAL_REFRESH_TOKEN |
| OIDC session ID | PORTAL_OIDC_SESSION_ID |
| OIDC request ID | PORTAL_OIDC_REQUEST_ID |
| SAML session ID | PORTAL_SAML_SESSION_ID |
| Cross-device session ID | PORTAL_CROSS_DEVICE_SESSION_ID |
set cookie name prefix portal preserves the legacy uppercasing behavior.
The shared spelling cookie prefix PORTAL preserves the supplied case.
With neither statement, every role uses the same suffix with AUTHP_.
For initialized Go configs, call SetCookieNamePrefix; assigning
CookieNamePrefix directly does not rename already initialized fields.
The SAML session cookie binds a SAML login to its initiating browser. It uses
host-only scope, path /, Secure, HttpOnly, SameSite=None and a 300-second
lifetime. Its name participates in shared prefix, override and collision checks;
changing its name does not weaken SAML state or assertion validation.
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- today First seen · 359 lines · 34 tokens per session scan A 32c9cd9f6c18
configuration-authentication-cookies is a skill published in the GitHub repository greenpau/caddy-security (2,263 stars, last pushed today), licensed Apache-2.0. It adds 34 tokens to every session and 3,735 once invoked, about $0.0001 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 2026-10-25.
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