For agents

Publish the folder ./my-folder to Filecoin Onchain Cloud and give me a link I can share. This is mainnet and uses real funds.
1. Install the official publish skill into this project (needs Node 24 or newer): npx skills add filecoin-project/filecoin-skills --skill publish
2. Read the installed skill's SKILL.md and follow it. If it needs me to log in or add funds, stop and tell me exactly what to do.
3. I am asking for a cost preview before any real upload: run the dry run with the same options the real publish will use. Tell me the deposit needed now, the one-time fees and the monthly storage rate, and list the files that will become public.
4. Do not publish or move any funds until I say yes.
5. After I say yes: publish, wait until the link is confirmed working, and give me the link.

Uses the official publish skill, which writes to mainnet and needs a funded wallet. Tested as far as the cost preview; the agent then waits for your yes.

Read a file back from Filecoin Onchain Cloud and check it. The file's IPFS CID is bafybeiapnvjfxw2w7556sb7ixrhhy26nk6p36tmuh27hkysaqiw4kpr7my.
1. Ask the public index which storage providers hold it: GET https://cid.contact/cid/<CID>. Provider addresses are under MultihashResults[].ProviderResults[].Provider.Addrs and look like /dns/HOST/tcp/443/https, which means https://HOST.
2. Download it from one of those providers as a CAR file: GET https://HOST/ipfs/<CID> with the header "Accept: application/vnd.ipld.car". If one provider fails, try the next.
3. Check that every block in the CAR hashes to its own CID and that the CAR's root is the CID I gave you. Then unpack the file from the CAR (it is UnixFS; a tool such as ipfs-car or ipfs-unixfs-exporter does this).
4. Tell me the unpacked file's type, its size in bytes and its SHA-256.

Needs no wallet and costs nothing. Swap in any CID; this one is a photograph from the archive on this site. Tested end to end.