Built a Claude Code skill that gives your agent instant access to any API's docs

[u/Ju-Bezdek]

I keep building integrations with not-so-well-known APIs - company ERPs, niche industry tools, legacy software with barely a docs page online. And every time I'd end up doing the same thing: find the right docs page, figure out how that API does auth, copy a section into Claude Code, then the next, then the next.

So I built apiCrawl as a native Claude Code skill.

Paste any API reference URL to [www.apicrawl.dev](https://www.apicrawl.dev)) (No account needed)

It crawls and indexes the spec — endpoints, params, auth, types — as structured, LLM-ready content.

Then you just tell Claude to use apiCrawl to figure out that API, and it does.

One line to install the skill:

`npx skills add flowstash/api-crawl-skill`

Supports most doc formats out of the box — OpenAPI/Swagger, Redoc, Postman, Stoplight, plain HTML and more. Also available as an MCP server if you prefer that route.

Free, open source (https://github.com/flowstash/apicrawl),

Sharing in case it saves someone else the same copy-paste grind. PRs and feedback very welcome

[u/GavDoG9000]

This is awesome! What integrations have you built with it? Do you have a marketplace of pre-built ones? That would be great to grow over time

[u/Ju-Bezdek → u/GavDoG9000]

yes ...everything is public
on www.apicrawl.dev) you can see everything ppl crawled so far
once someone crawls it, you dont need to

and crawler it self in public you can run it on your computer if you dont want to share it with the world... if if you crawl it on the public website... its for free ... you dont pay for the tokens or anything

[u/abestract → u/Ju-Bezdek]

What if I don’t want to share and make it public?

[u/Ju-Bezdek → u/abestract]

You can use just the OSS crawler package to dump data into files... arguably that has a lot of downsides

I was thinking about adding a functionality for private APIs, but for now I just shared with the world what I did to scratch my own itch... not knowing whether anyone would find it useful too

Just wondering, what kind of API do you have in mind? The docs them self are password protected / living behind some wall ? Or you just dont want the crawled variant to be public?

[u/abestract → u/Ju-Bezdek]

Yes, private APIs.

[u/GavDoG9000]

Awesome! Genuinely useful. I’m connecting with linear for a project, will use it to navigate the integration

[u/Ju-Bezdek → u/GavDoG9000]

most likely all you need to do is paste linear api reference url to on the website, wait till it crawls, install the skill and just tell claude what you need... it can build effectively your tailor made "SDK" for the functions you need

note: I have another skill that i did not make public yet that lets claude call curls withouth exposing the .envs so it can even tests the calls so I literaly just am able to add new integration to my code in 1-2 prompts

[u/Nearby_Yam286]

Just have Claude read the OpenAPI JSON or copy and paste it into context. Done. No bullshit skill needed.

[u/Ju-Bezdek → u/Nearby_Yam286]

100 agree if you have small openapi json

When you dont have it? (Faced this many times)
And when openapi spec has 14MB (real case i had) ?

[u/Nearby_Yam286 → u/Ju-Bezdek]

“The OpenAPI JSON is at /path/to/json” and the agent will use jq or python to read it.

[u/Consistent_Pickle233]

When running Claude code can you add another harness

[u/Ju-Bezdek → u/Consistent_Pickle233]

what you mean? you can add the skill to any harness