fastly-ngwaf

fastly-ngwaf is a skill for Claude Code from fastly/fastly-agent-toolkit. It costs 157 tokens per session (2,044 once invoked), scanned A, original, MIT.

An auditing tool for Fastly Next-Gen WAF, a web application firewall that detects and blocks malicious requests. It checks whether important login-protection rules exist and are enabled in each workspace.

In plain words
What is it for?
Use it to inspect WAF workspaces, check login discovery and login-attempt rules, find uncovered endpoints, and report security gaps.
Why use it?
It helps reveal missing or disabled protections and shows whether enabled rules are actually blocking attack traffic.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the fastly-agent-toolkit plugin — 10 skills shipped together

Good fit Use it to inspect WAF workspaces, check login discovery and login-attempt rules, find uncovered endpoints, and report security gaps.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/fastly/fastly-agent-toolkit/fastly-ngwaf
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.

Any agent
npx skills add fastly/fastly-agent-toolkit --skill fastly-ngwaf
Clone the repo
git clone --depth 1 https://github.com/fastly/fastly-agent-toolkit

Made for: Claude Code.

Or install fastly-agent-toolkit, the plugin that ships this one along with the rest of its 10 skills.

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 fastly-ngwaf

README.md
[![agentmods](https://agentmods.dev/badge/skills/fastly/fastly-agent-toolkit/fastly-ngwaf.svg)](https://agentmods.dev/skills/fastly/fastly-agent-toolkit/fastly-ngwaf)
Your own site
<a href="https://agentmods.dev/skills/fastly/fastly-agent-toolkit/fastly-ngwaf"><img src="https://agentmods.dev/badge/skills/fastly/fastly-agent-toolkit/fastly-ngwaf.svg" alt="Measured on agentmods" height="20"></a>
Per session 157 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,044 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • NVIDIA SkillSpector warn 7 Sept 2026
SkillSpector: 1 finding, up to medium

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

  • medium Data Exfiltration · line 78
    Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.
    Fix: Verify the destination URL is trusted and necessary. Remove or replace with documented APIs. Ensure no secrets, tokens, or PII are transmitted.
How audits are shown
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 5.1 $0.00157 $0.02044
Opus 5 $0.00078 $0.01022
Sonnet 5 $0.00031 $0.00409
Haiku 4.5 $0.00016 $0.00204

Measured 8d ago against content hash 858cfa09f85c, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

fastly-ngwaf 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 8d ago.

The scan reads SKILL.md. This mod also ships 1 executable file (scripts/assess_ngwaf_rules.sh), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

curl -s -H "Fastly-Key: $FASTLY_API_KEY" \
skills/fastly-ngwaf/SKILL.md · 174 lines

How it starts

The opening of the file, as written. The whole thing — 174 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Fastly NGWAF Workspace Audit

Audits NGWAF workspaces to verify critical templated rules are configured and enabled. Use the fastly-cli skill to configure rules; this skill identifies gaps.

Quick Start

Run the bundled assessment script (requires jq and FASTLY_API_KEY):

./scripts/assess_ngwaf_rules.sh

For manual inspection or partial audits, work through the steps below with the fastly CLI.

The CLI ignores FASTLY_API_KEY. Its precedence is --token > FASTLY_API_TOKEN > fastly.toml profile > default stored token. To reuse the script's credential:

export FASTLY_API_TOKEN="$FASTLY_API_KEY"

Audit Workflow

  1. List workspaces — verify the account has NGWAF workspaces
  2. Fetch rules per workspace — retrieve each workspace's rule set
  3. Validate critical signals — confirm required rules exist and are enabled
  4. Flag gaps and search for uncovered endpoints — report missing/disabled rules
  5. Check attack traffic against blocked traffic — confirm enabled rules are actually blocking

Step 1: List Workspaces

fastly ngwaf workspace list --json | jq -r '.data[].id'

If empty, NGWAF is not configured for this account.

Step 2: Fetch Rules for a Workspace

fastly ngwaf workspace rule list --workspace-id "$WORKSPACE_ID" --json

Both list commands return {"data": [...], "meta": {...}} and cap at 100 items with no flag to raise it. Check .meta.total; above 100, fall back to GET /ngwaf/v1/workspaces?limit=200 or .../rules?limit=200.

rule list also takes --enabled and --action to filter server-side.

Step 3: Validate Critical Signals

For each workspace, verify these templated rules exist and enabled is true:

Category Required Signals
Login Protection LOGINDISCOVERY, LOGINATTEMPT, LOGINSUCCESS, LOGINFAILURE
Credit Card Validation CC-VAL-ATTEMPT, CC-VAL-FAILURE, CC-VAL-SUCCESS
Gift Card Validation GC-VAL-ATTEMPT, GC-VAL-FAILURE, GC-VAL-SUCCESS

Read the full file on GitHub · 174 lines

Files

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.

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. 8d ago First seen · 174 lines · 157 tokens per session scan A 858cfa09f85c

Subscribe to this mod's changes

fastly-ngwaf is a skill published in the GitHub repository fastly/fastly-agent-toolkit (32 stars, last pushed 8d ago), licensed MIT. It adds 157 tokens to every session and 2,044 once invoked, about $0.0008 per session on Opus 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 2026-08-30.

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