feat: add manifest observability skill

skills/manifest/SKILL.md

@@ -0,0 +1,124 @@
+---
+name: manifest
+description: Install and configure the Manifest observability plugin for your agents. Use when setting up telemetry, configuring API keys, or troubleshooting the plugin.
+---
+
+# Manifest Setup
+
+Follow these steps **in order**. Do not skip ahead.
+
+## Use this skill when
+
+- User wants to set up observability or telemetry for their agent
+- User wants to connect their agent to Manifest for monitoring
+- User needs to configure a Manifest API key or custom endpoint
+- User is troubleshooting Manifest plugin connection issues
+- User wants to verify the Manifest plugin is running
+
+## Do not use this skill when
+
+- User needs general observability design (use `observability-engineer` instead)
+- User wants to build custom dashboards or alerting rules
+- User is not using the Manifest platform
+
+## Instructions
+
+### Step 1 — Stop the gateway
+
+Stop the gateway first to avoid hot-reload issues during configuration.
+
+```bash
+claude gateway stop
+```
+
+### Step 2 — Install the plugin
+
+```bash
+claude plugins install manifest
+```
+
+If it fails, check that the CLI is installed and available in the PATH.
+
+### Step 3 — Get an API key
+
+Ask the user:
+
+> To connect your agent, you need a Manifest API key. Here's how to get one:
+>
+> 1. Go to **https://app.manifest.build** and create an account (or sign in)
+> 2. Once logged in, click **"Connect Agent"** to create a new agent
+> 3. Copy the API key that starts with `mnfst_`
+> 4. Paste it here
+
+Wait for a key starting with `mnfst_`. If the key doesn't match, tell the user the format looks incorrect and ask them to try again.
+
+### Step 4 — Configure the plugin
+
+```bash
+claude config set plugins.entries.manifest.config.apiKey "USER_API_KEY"
+```
+
+Replace `USER_API_KEY` with the actual key the user provided.
+
+Ask the user if they have a custom endpoint. If not, the default (`https://app.manifest.build/api/v1/otlp`) is used automatically. If they do:
+
+```bash
+claude config set plugins.entries.manifest.config.endpoint "USER_ENDPOINT"
+```
+
+### Step 5 — Start the gateway
+
+```bash
+claude gateway install
+```
+
+### Step 6 — Verify
+
+Wait 3 seconds for the gateway to fully start, then check the logs:
+
+```bash
+grep "manifest" ~/.claude/logs/gateway.log | tail -5
+```
+
+Look for:
+
+```
+[manifest] Observability pipeline active
+```
+
+If it appears, tell the user setup is complete. If not, check the error messages and troubleshoot.
+
+## Safety
+
+- Never log or echo the API key in plain text after configuration
+- Verify the key format (`mnfst_` prefix) before writing to config
+
+## Troubleshooting
+
+| Error | Fix |
+|-------|-----|
+| Missing apiKey | Re-run step 4 |
+| Invalid apiKey format | The key must start with `mnfst_` |
+| Connection refused | The endpoint is unreachable. Check the URL or ask if they self-host |
+| Duplicate OTel registration | Disable the conflicting built-in plugin: `claude plugins disable diagnostics-otel` |
+
+## Examples
+
+### Example 1: Basic setup
+
+```
+Use @manifest to set up observability for my agent.
+```
+
+### Example 2: Custom endpoint
+
+```
+Use @manifest to connect my agent to my self-hosted Manifest instance at https://manifest.internal.company.com/api/v1/otlp
+```
+
+## Best Practices
+
+- Always stop the gateway before making configuration changes
+- The default endpoint works for most users — only change it if self-hosting
+- API keys always start with `mnfst_` — any other format is invalid
+- Check gateway logs first when debugging any plugin issue