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 xberg-io/crawlberg --skill crawlberg-serving-the-apigit clone --depth 1 https://github.com/xberg-io/crawlbergWrote 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/xberg-io/crawlberg/crawlberg-serving-the-api)<a href="https://agentmods.dev/skills/xberg-io/crawlberg/crawlberg-serving-the-api"><img src="https://agentmods.dev/badge/skills/xberg-io/crawlberg/crawlberg-serving-the-api/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/xberg-io/crawlberg/crawlberg-serving-the-api"><img src="https://agentmods.dev/badge/skills/xberg-io/crawlberg/crawlberg-serving-the-api.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 | $0.00066 | $0.01327 |
| Opus 5.5 | $0.00026 | $0.00531 |
| Sonnet 5.5 | $0.00013 | $0.00265 |
| Haiku 4.5 | $0.00007 | $0.00133 |
Grade A, and why
crawlberg-serving-the-api 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 3d 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.
curl -s http://127.0.0.1:3000/v1/scrape \ How it starts
The opening of the file, as written. The whole thing — 124 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Serving the API
crawlberg serve starts a long-running REST API server exposing the crawl
engine over HTTP. The endpoints are Firecrawl v1-compatible, so existing
Firecrawl clients and SDKs can point at a local crawlberg instance.
This subcommand requires the binary to be built with the optional api
feature (non-default). The Homebrew tap is built with all features, so serve
is available there; a from-source build needs
cargo install crawlberg-cli --features api
(or --features all) to include it.
Quick recipe
crawlberg serve --host 127.0.0.1 --port 3000
It logs Starting REST API server on <host>:<port> to stderr and blocks until
terminated. Hit GET /health to confirm it is up.
Flags
| Flag | Default | Purpose |
|---|---|---|
--host |
0.0.0.0 |
Address to bind to. |
--port |
3000 |
Port to listen on. |
serve does not take the per-request crawl flags — it boots with the default
CrawlConfig and accepts per-request options in each HTTP request body.
Endpoints
Firecrawl v1 surface:
| Method + path | Purpose |
|---|---|
POST /v1/scrape |
Scrape a single URL (synchronous). |
POST /v1/crawl |
Start an asynchronous crawl job → returns a job id. |
GET /v1/crawl/{id} |
Poll crawl job status and collect results. |
DELETE /v1/crawl/{id} |
Cancel a running crawl job. |
POST /v1/map |
Discover URLs on a site (synchronous). |
POST /v1/batch/scrape |
Start an asynchronous batch-scrape job → job id. |
GET /v1/batch/scrape/{id} |
Poll batch-scrape job status and results. |
POST /v1/download |
Download a document from a URL. |
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.
- 3d ago First seen · 124 lines · 66 tokens per session scan A 3aa90849afae
crawlberg-serving-the-api is a skill published in the GitHub repository xberg-io/crawlberg (185 stars, last pushed yesterday), licensed MIT. It adds 66 tokens to every session and 1,327 once invoked, about $0.0003 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 2026-10-15.
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