The free library
Free tools from Endlessly, each checked on the date shown beside it. Read anything before you use it, including my own files.
Made by Bhanu Mendis (@bhanu_mendis ), Colombo.
1. Skill
derive-first
A Claude skill that teaches by making you work things out first. Plain text, no code.
Download derive-first.zip
Install: Customize > Skills > + > Create skill > Upload a skill. Skills need code execution turned on, and availability depends on your plan, so check Customize > Skills.
Check the file first. Compare this checksum with the file you downloaded. Windows PowerShell: Get-FileHash derive-first.zip -Algorithm SHA256. Mac or Linux: shasum -a 256 derive-first.zip. If they differ, don't install it.
SHA-256 78d0982801a5a463f087f0b1127d9da4c4b29b5f9f5f1a3afacac9f27ef2953e
2. Cheat sheet
Which Claude for which job
One page, checked Oct 1, 2026. API prices per million tokens, not app subscription prices.
Download the PDF
Source: platform.claude.com/docs/en/models/overview, checked Oct 1, 2026
3. Build kit
One prompt, three tweaks, one page you can share
The prompt from the reel and my five-point check before you publish anything.
Open the build kit 4. Weekly roundup
The week in AI, checked
Join the WhatsApp Channel: one short checked update each Friday. Channels are one-way and I can't see your number.
In WhatsApp, open Updates, then Find channels, and search "Endlessly AI".
Independent. Not affiliated with Anthropic, OpenAI, Google or any company covered. Not certification prep, and not a Claude Partner Network training provider. Claude helps me research and draft the scripts, and makes the graphics. I check every script and card against its sources. The voice and screen recordings are mine.
If you comment a keyword, I keep your Instagram handle, the keyword, the date and your 1 or 2 answer for up to 90 days so I can send you the file, then I delete them. DM me to delete them sooner. This page is for adults, 18 and over. I don't knowingly collect data from children. This page has no sign-up form, no cookies and no tracking.
Wrong? DM @endlessly.ai on Instagram with the source and I'll fix it.
© 2026 Bhanu Mendis, founder of Endlessly (@bhanu_mendis ). The derive-first skill is shared under CC BY 4.0 (see its licence file). The cheat sheet and build kit are free to share unchanged, with credit, and not for resale.