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 maludb-ed/htmx-php-builder --skill php-session-authgit clone --depth 1 https://github.com/maludb-ed/htmx-php-builderWrote 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/maludb-ed/htmx-php-builder/php-session-auth)<a href="https://agentmods.dev/skills/maludb-ed/htmx-php-builder/php-session-auth"><img src="https://agentmods.dev/badge/skills/maludb-ed/htmx-php-builder/php-session-auth/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/maludb-ed/htmx-php-builder/php-session-auth"><img src="https://agentmods.dev/badge/skills/maludb-ed/htmx-php-builder/php-session-auth.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 | $0.00056 | $0.01923 |
| Opus 5.5 | $0.00022 | $0.00769 |
| Sonnet 5.5 | $0.00011 | $0.00385 |
| Haiku 4.5 | $0.00006 | $0.00192 |
Grade A, and why
php-session-auth scanned grade A with 1 finding 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 1mo 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
$u = $stmt->fetch(PDO::FETCH_ASSOC); How it starts
The opening of the file, as written. The whole thing — 135 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Vanilla PHP Session Auth + CSRF
Overview
Building session auth in vanilla PHP is mostly solved by password_hash, hash_equals, and session_regenerate_id — agents apply those reliably. The failures are judgment calls this skill exists to fix: missing brute-force protection, un-normalized emails, CSRF guards that only cover POST, and "hardening" that is actually an anti-pattern.
Core principle: the cryptography is the easy part. The security comes from the policy around it — rate limits, normalization, what you choose not to do.
When to Use
- Implementing login / registration / logout in PHP without a framework
- Adding CSRF protection to state-changing forms
- Reviewing hand-rolled PHP auth for security gaps
When NOT to use: Laravel/Symfony (their auth + CSRF are built in — use those, don't hand-roll).
Non-Negotiables (checklist)
| Requirement | Rule |
|---|---|
| Password storage | password_hash($pw, PASSWORD_DEFAULT) + password_verify. Re-hash on login via password_needs_rehash. |
| Password length | Min 12 chars; max 72 bytes (bcrypt silently truncates past 72). |
Normalize: strtolower(trim($email)) before BOTH insert and lookup. Enforce a UNIQUE index and catch SQLSTATE 23000. |
|
| Session login | session_regenerate_id(true) on every privilege change (login, logout, role change). |
| CSRF token | Per-session, bin2hex(random_bytes(32)), compared with hash_equals. Rotate on login. |
| CSRF guard | Validate on every unsafe method (POST, PUT, PATCH, DELETE) — not POST alone. |
| Brute force | Rate-limit + lock login attempts per account AND per IP. Non-optional. |
| Enumeration | Generic errors on login AND register; equalize timing with a precomputed dummy hash. |
| Cookies | HttpOnly, Secure (in prod), SameSite=Lax. |
| Headers | On auth pages: Cache-Control: no-store, X-Frame-Options: DENY, Referrer-Policy: same-origin. |
Correct Patterns
Session bootstrap (before session_start()):
session_set_cookie_params([
'lifetime' => 0, 'path' => '/', 'secure' => $isHttps,
'httponly' => true, 'samesite' => 'Lax',
]);
ini_set('session.use_strict_mode', '1'); // reject attacker-supplied SIDs
ini_set('session.use_only_cookies', '1');
session_name('SID');
session_start();
What ships with it
2 files 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.
- 1mo ago First seen · 135 lines · 56 tokens per session scan A f73cb1579da8
php-session-auth is a skill published in the GitHub repository maludb-ed/htmx-php-builder (9 stars, last pushed 14d ago), licensed MIT. It adds 56 tokens to every session and 1,923 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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