Add repository metadata and package AI skill

skills/crypstie/SKILL.md

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+---
+name: crypstie
+description: Create and open end-to-end encrypted Crypstie links with the crypstie npm CLI. Use when an agent must securely exchange text or files through crypstie.com, decrypt an existing Crypstie URL without a browser, create reusable or burn-on-read links, or automate Crypstie from a shell.
+---
+
+# Crypstie
+
+Use the `crypstie` CLI. Install it with `npm install --global crypstie` if the
+command is unavailable.
+
+## Open a link
+
+Quote URLs because they contain `#`:
+
+```shell
+crypstie open "$CRYPSTIE_URL"
+```
+
+Write binary content directly to a file:
+
+```shell
+crypstie open "$CRYPSTIE_URL" --output ./result.bin
+```
+
+Use `--json` only when metadata or Base64 data is required.
+
+## Create a link
+
+Pipe text without making a temporary plaintext file:
+
+```shell
+printf '%s' "$CONTENT" | crypstie create
+```
+
+Create from a file and set lifetime:
+
+```shell
+crypstie create ./input.bin --days 7
+```
+
+Add `--burn` only when the user requests deletion after reading.
+
+## Handle secrets
+
+- Treat the complete URL as a secret: anyone holding it can decrypt the data.
+- Never omit the fragment after `#`; it contains the local decryption key.
+- Avoid repeating a full URL in explanations, logs, issues, or source files.
+- Return a newly created URL only to the requesting user.
+- Prefer environment variables when opening links in automation.
+- Remember that Crypstie protects stored content, not endpoints where plaintext
+  is read or written.

skills/crypstie/agents/openai.yaml

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+interface:
+  display_name: "Crypstie"
+  short_description: "Create and open encrypted Crypstie links"
+  default_prompt: "Use $crypstie to securely create or open a Crypstie link."