Document skill source references

README.md

@@ -1,3 +1,10 @@
 # skills
 
 Personal agent skills packaged through Nix.
+
+## Skill sources
+
+Some skills adapt workflows or helper scripts from public examples.
+
+- `axi-review` is based on the [AXI principles](https://axi.md/).
+- `youtube-transcript` is based on [`amosblomqvist/pi-config/skills/youtube-transcript`](https://github.com/amosblomqvist/pi-config/tree/main/skills/youtube-transcript).

skills/axi-review/AXI-PRINCIPLES.md

@@ -1,6 +1,6 @@
 # The 10 AXI Principles — review rubric
 
-The canonical statements come from axi.md, which is the authority for the wording.
+The canonical statements come from [`axi.md`](https://axi.md/), which is the authority for the wording.
 Each entry distils the canonical statement, gives the black-box probe to run, and the criteria that map observed output to a verdict.
 Judge against the canonical statement, not against any single tool's interpretation.
 

skills/axi-review/SKILL.md

@@ -1,6 +1,6 @@
 ---
 name: axi-review
-description: Review a CLI for conformance to the 10 AXI (Agent eXperience Interface) principles by running it black-box and scoring each principle on a report card. Use when asked to review, audit, check, or measure a CLI's AXI conformance, or when "AXI principles", "Agent eXperience Interface", or axi.md is named.
+description: Review a CLI for conformance to the 10 AXI (Agent eXperience Interface) principles by running it black-box and scoring each principle on a report card. Use when asked to review, audit, check, or measure a CLI's AXI conformance, or when "AXI principles", "Agent eXperience Interface", or https://axi.md/ is named.
 ---
 
 # axi-review