feat: add native Ponytail support for Amp

.agents/setup

@@ -36,4 +36,6 @@ if [[ ! -f .env ]]; then
 	cp -- .env.example .env
 fi
 
+exec "$SHELL" -l
+
 echo "Orb setup complete"

.github/README.md

@@ -37,6 +37,19 @@ Install all skills:
 npx skills@latest add o-az/skills --all
 ```
 
+## Amp plugins
+
+### Ponytail
+
+The [Ponytail plugin](/plugins#ponytail) adds always-on, mode-aware
+[Ponytail](https://github.com/dietrichgebert/ponytail) support to Amp:
+
+```bash
+mkdir -p ~/.config/amp/plugins
+curl -fsSL https://raw.githubusercontent.com/o-az/skills/main/plugins/ponytail.ts \
+  -o ~/.config/amp/plugins/ponytail.ts
+```
+
 ## Contributing a new Skill
 
 0. Copy skill template

mise.toml

@@ -5,15 +5,7 @@ color = true
 pipx.uvx = true
 experimental = true
 color_theme = "charm"
-minimum_release_age_excludes = [
-  "hk",
-  "uv",
-  "pkl",
-  "bun",
-  "node",
-  "npm:oxfmt",
-  "npm:oxlint"
-]
+minimum_release_age_excludes = ["hk", "uv", "pkl", "bun", "node", "npm:oxfmt", "npm:oxlint"]
 
 [env]
 HK_MISE = 1

package.json

@@ -17,6 +17,7 @@
     "validate-skills": "bash -c 'for dir in skills/*/; do uvx --from skills-ref agentskills validate $dir; done'"
   },
   "devDependencies": {
+    "@ampcode/plugin": "^0.0.0-20260805002929-g5b1c43a",
     "oxfmt": "^0.61.0",
     "oxlint": "^1.76.0",
     "oxlint-tsgolint": "^7.0.2001",

plugins/README.md

@@ -0,0 +1,64 @@
+# Amp plugins
+
+## Ponytail
+
+[Ponytail](https://github.com/dietrichgebert/ponytail) forces the smallest
+solution that actually works. The Amp plugin applies Ponytail on every agent
+turn, keeps intensity modes isolated per thread, and exposes native controls in
+Amp's command palette.
+
+Install it as a system plugin on macOS or Linux:
+
+```sh
+mkdir -p ~/.config/amp/plugins
+curl -fsSL https://raw.githubusercontent.com/o-az/skills/main/plugins/ponytail.ts \
+  -o ~/.config/amp/plugins/ponytail.ts
+```
+
+Then run `plugins: reload` from Amp's command palette or restart Amp.
+
+The current Amp CLI only accepts Amp-hosted URLs in `amp plugins add`. Rerun
+the command above to update this GitHub-hosted plugin.
+
+### Use
+
+Ponytail starts in `full` mode. Open the command palette and use:
+
+- `ponytail: Change mode` — set `off`, `lite`, `full`, or `ultra` for the
+  active thread.
+- `ponytail: Show status` — show the active and default modes.
+- `ponytail: Set default mode` — save the mode used by new threads.
+- `ponytail: Open documentation` — open Ponytail's upstream documentation.
+
+The equivalent prompt commands also work. The `/` prefix is optional; `@` and
+`$` are accepted for compatibility with Ponytail's other adapters.
+
+```text
+/ponytail status
+/ponytail lite
+/ponytail full
+/ponytail ultra
+/ponytail off
+/ponytail default full
+stop ponytail
+normal mode
+```
+
+`stop ponytail` and `normal mode` only deactivate Ponytail when the entire
+prompt is the command, so ordinary requests containing either phrase do not
+switch modes accidentally.
+
+Thread modes last for the current Amp process and reset to the configured
+default after Amp or the plugin restarts.
+
+Set `PONYTAIL_DEFAULT_MODE=off|lite|full|ultra` to override the saved default.
+
+Remove the plugin with:
+
+```sh
+rm ~/.config/amp/plugins/ponytail.ts
+```
+
+The Ponytail instructions embedded in the plugin are adapted from
+`dietrichgebert/ponytail` and distributed under its MIT license; the complete
+license notice is included in `ponytail.ts`.