feat(plugin): support agent plugin spec

.claude-plugin/marketplace.json

@@ -9,10 +9,7 @@
   "plugins": [
     {
       "name": "spanner",
-      "source": {
-        "source": "git",
-        "url": "https://github.com/gemini-cli-extensions/spanner.git"
-      },
+      "source": "./",
       "policy": {
         "installation": "AVAILABLE",
         "authentication": "ON_INSTALL"

.claude-plugin/plugin.json

@@ -9,31 +9,5 @@
   "homepage": "https://cloud.google.com/spanner",
   "license": "Apache-2.0",
   "repository": "https://github.com/gemini-cli-extensions/spanner",
-  "skills": "./skills/",
-  "userConfig": {
-    "spanner_project": {
-      "title": "Project ID",
-      "description": "ID of the Google Cloud project",
-      "type": "string",
-      "sensitive": false
-    },
-    "spanner_instance": {
-      "title": "Instance",
-      "description": "ID of the Spanner instance",
-      "type": "string",
-      "sensitive": false
-    },
-    "spanner_database": {
-      "title": "Database",
-      "description": "ID of the Spanner database",
-      "type": "string",
-      "sensitive": false
-    },
-    "spanner_dialect": {
-      "title": "Database Dialect",
-      "description": "(Optional) The SQL dialect of the Spanner Database: 'googlesql' or 'postgresql'. (Default: 'googlesql')",
-      "type": "string",
-      "sensitive": false
-    }
-  }
+  "skills": "./skills/"
 }

.lycheeignore

@@ -1,2 +1,3 @@
 https://github.com/gemini-cli-extensions/spanner/compare/
 https://www.npmjs.com/package/skills
+https://agent-plugins.org/compatible-clients

CHANGELOG.md

@@ -44,7 +44,7 @@
 * **tool/spanner-sql,tool/spanner-execute-sql:** Use read-only annotations when readOnly is set ([mcp-toolbox#​3338](https://redirect.github.com/googleapis/mcp-toolbox/issues/3338)) ([8bde0ec](https://redirect.github.com/googleapis/mcp-toolbox/commit/8bde0ec08f8bf455f319523b4faacf32bdbc65ff)) ([49be417](https://github.com/gemini-cli-extensions/spanner/commit/49be417d6a5451e0f244733f5da7f5be2029caa7))
 * **tools:** Initialize query result slices to empty array ([mcp-toolbox#​3250](https://redirect.github.com/googleapis/mcp-toolbox/issues/3250)) ([60ddf48](https://redirect.github.com/googleapis/mcp-toolbox/commit/60ddf487468bfd11c7f9346f16a33a8986f89f84)) ([49be417](https://github.com/gemini-cli-extensions/spanner/commit/49be417d6a5451e0f244733f5da7f5be2029caa7))
 * Bound MCP HTTP body size ([mcp-toolbox#​3216](https://redirect.github.com/googleapis/mcp-toolbox/issues/3216)) ([d4f4342](https://redirect.github.com/googleapis/mcp-toolbox/commit/d4f434251392fb597779a90a12c63d21533ea187)) ([49be417](https://github.com/gemini-cli-extensions/spanner/commit/49be417d6a5451e0f244733f5da7f5be2029caa7))
-* Escape delimiter characters in applyEscape to prevent SQL injection ([mcp-toolbox#​2811](https://redirect.github.com/googleapis/mcp-toolbox/issues/2811)) ([932519a](https://redirect.github.com/googleapis/mcp-toolbox/commit/932519a9551861bf5f18787dc43b20d06350343f)) ([49be417](https://github.com/gemini-cli-extensions/spanner/commit/49be417d6a5451e0f244733f5da7f5be2029caa7))
+* Escape delimiter characters in applyEscape to prevent SQL injection ([932519a](https://redirect.github.com/googleapis/mcp-toolbox/commit/932519a9551861bf5f18787dc43b20d06350343f)) ([49be417](https://github.com/gemini-cli-extensions/spanner/commit/49be417d6a5451e0f244733f5da7f5be2029caa7))
 
 ## [0.3.1](https://github.com/gemini-cli-extensions/spanner/compare/0.3.0...0.3.1) (2026-05-07)
 

README.md

@@ -22,6 +22,8 @@ This repository provides a set of agent skills to interact with [Google Cloud Sp
     - [Antigravity](#antigravity)
     - [Claude Code](#claude-code)
     - [Codex](#codex)
+- [Installing using open agent skills tool](#installing-using-open-agent-skills-tool)
+- [Installing via a compatible Agent Plugins client](#installing-via-a-compatible-agent-plugins-client)
 - [Usage Examples](#usage-examples)
 - [Supported Skills](#supported-skills)
 - [Additional Agent Skills](#additional-agent-skills)
@@ -198,6 +200,19 @@ For detailed info check out the [Skills npm package](https://www.npmjs.com/packa
 **2. Set env vars:**
 Set your environment vars as described in the [configuration section](#configuration).
 
+## Installing via a compatible Agent Plugins client
+
+This repository is a valid [Agent Plugins](https://github.com/agentplugins/agent-plugins-spec) (v1) plugin. Any [Agent Plugins–compatible client](https://agent-plugins.org/compatible-clients) can install it directly using its own built-in plugin command — no extra tooling required — by pointing at this repository:
+
+```
+https://github.com/gemini-cli-extensions/spanner
+```
+
+Beyond harnesses covered by the native install above, compatible clients include VS Code, Cursor, GitHub Copilot, and Kiro. See your agent's documentation for its exact install command.
+
+**Set env vars:**
+Set your environment vars as described in the [configuration section](#configuration).
+
 <!-- {x-release-please-end} -->
 
 ## Usage Examples

plugin.json

@@ -0,0 +1,18 @@
+{
+  "$schema": "https://agent-plugins.org/schemas/1.0.0/plugin.schema.json",
+  "name": "spanner",
+  "version": "0.3.2",
+  "description": "Connect and interact with Spanner data using natural language.",
+  "author": {
+    "name": "Google LLC",
+    "email": "data-cloud-ai-integrations@google.com"
+  },
+  "homepage": "https://cloud.google.com/spanner",
+  "repository": "https://github.com/gemini-cli-extensions/spanner",
+  "license": "Apache-2.0",
+  "keywords": [
+    "spanner",
+    "google-cloud",
+    "database"
+  ]
+}

release-please-config.json

@@ -43,8 +43,13 @@
           "type": "json",
           "path": ".claude-plugin/plugin.json",
           "jsonpath": "$.version"
+        },
+        {
+          "type": "json",
+          "path": "plugin.json",
+          "jsonpath": "$.version"
         }
       ]
     }
   }
-}
+}