Create Claude Plugin

.agents/plugins/marketplace.json

@@ -0,0 +1,20 @@
+{
+  "name": "spacetimedb-plugins",
+  "interface": {
+    "displayName": "SpacetimeDB"
+  },
+  "plugins": [
+    {
+      "name": "spacetimedb",
+      "source": {
+        "source": "local",
+        "path": "./codex-plugin/plugins/spacetimedb"
+      },
+      "policy": {
+        "installation": "AVAILABLE",
+        "authentication": "ON_USE"
+      },
+      "category": "Developer Tools"
+    }
+  ]
+}

.claude-plugin/README.md

@@ -0,0 +1,20 @@
+# SpacetimeDB for Claude Code
+
+`marketplace.json` here installs the repository's `skills/` directory and the SpacetimeDB MCP
+server into Claude Code:
+
+```bash
+claude plugin marketplace add clockworklabs/SpacetimeDB
+claude plugin install spacetimedb@spacetimedb-plugins
+```
+
+From a local checkout, use `./` as the source. Confirm with `claude plugin details spacetimedb`,
+which lists the skills and the MCP server. The MCP server runs `spacetime mcp`, which bridges
+stdio to the HTTP endpoint on whichever server your CLI is configured for.
+
+## Maintaining
+
+The entry uses `strict: false`, so it reads `skills/` directly and needs no manifest inside a
+plugin payload. It lists each skill explicitly, so adding one under `skills/` means adding it
+here too. `cargo ci lint` fails when the list and the directory disagree. Validate the catalog
+with `claude plugin validate .`.

.claude-plugin/marketplace.json

@@ -0,0 +1,42 @@
+{
+  "$schema": "https://anthropic.com/claude-code/marketplace.schema.json",
+  "name": "spacetimedb-plugins",
+  "description": "SpacetimeDB plugins for Claude Code",
+  "owner": {
+    "name": "Clockwork Labs",
+    "url": "https://spacetimedb.com"
+  },
+  "plugins": [
+    {
+      "name": "spacetimedb",
+      "displayName": "SpacetimeDB",
+      "description": "SpacetimeDB skills for building modules and clients in Rust, C#, TypeScript, C++, Unity, and Unreal, plus an MCP server that lists your databases, reads schemas, runs SQL, and calls reducers with your CLI login.",
+      "author": {
+        "name": "Clockwork Labs"
+      },
+      "category": "database",
+      "homepage": "https://spacetimedb.com",
+      "source": "./skills",
+      "strict": false,
+      "skills": [
+        "./cli",
+        "./concepts",
+        "./cpp-server",
+        "./csharp-client",
+        "./csharp-server",
+        "./mcp",
+        "./rust-server",
+        "./typescript-client",
+        "./typescript-server",
+        "./unity",
+        "./unreal"
+      ],
+      "mcpServers": {
+        "spacetimedb": {
+          "command": "spacetime",
+          "args": ["mcp"]
+        }
+      }
+    }
+  ]
+}

tools/ci/src/main.rs

@@ -359,6 +359,43 @@ fn check_codex_plugin_skills_sync() -> Result<()> {
     Ok(())
 }
 
+fn check_claude_marketplace_skills() -> Result<()> {
+    // Claude catalog lists each skill explicitly, so a new skill under `skills/` is
+    // invisible to Claude until it is added there
+    let catalog_path = Path::new(".claude-plugin/marketplace.json");
+    let contents = fs::read_to_string(catalog_path).with_context(|| format!("reading {}", catalog_path.display()))?;
+    let catalog: Value =
+        serde_json::from_str(&contents).with_context(|| format!("parsing {}", catalog_path.display()))?;
+    let listed: BTreeSet<String> = catalog["plugins"][0]["skills"]
+        .as_array()
+        .ok_or_else(|| anyhow::anyhow!("{} plugins[0].skills must be an array", catalog_path.display()))?
+        .iter()
+        .filter_map(|value| value.as_str())
+        .map(|entry| entry.trim_start_matches("./").to_owned())
+        .collect();
+
+    let mut present = BTreeSet::new();
+    for entry in fs::read_dir("skills").with_context(|| "reading skills")? {
+        let entry = entry?;
+        if entry.path().join("SKILL.md").is_file() {
+            present.insert(entry.file_name().to_string_lossy().into_owned());
+        }
+    }
+
+    if listed != present {
+        let missing: Vec<_> = present.difference(&listed).cloned().collect();
+        let extraneous: Vec<_> = listed.difference(&present).cloned().collect();
+        bail!(
+            "{} skills list does not match skills/:\n  missing: {:?}\n  extraneous: {:?}\nUpdate the skills list in {}",
+            catalog_path.display(),
+            missing,
+            extraneous,
+            catalog_path.display()
+        );
+    }
+    Ok(())
+}
+
 #[derive(Subcommand)]
 enum CiCmd {
     /// Runs tests
@@ -683,6 +720,7 @@ fn main() -> Result<()> {
             ensure_repo_root()?;
             check_pnpm_release_age_policy()?;
             check_codex_plugin_skills_sync()?;
+            check_claude_marketplace_skills()?;
             // `cargo fmt --all` only checks files that Cargo discovers through workspace/package targets.
             // However, we also keep Rust sources in a locations that are tracked but not part of our workspace,
             // so this approach properly catches all the files, where `cargo fmt` does not.