diff --git a/a2as.yaml b/a2as.yaml
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--- /dev/null
+++ b/a2as.yaml
@@ -0,0 +1,77 @@
+manifest:
+  version: "0.1.3"
+  schema: https://a2as.org/cert/schema
+  subject:
+    name: derrickchwong/gemini-cli-on-adk
+    source: https://github.com/derrickchwong/gemini-cli-on-adk
+    branch: main
+    commit: "eaf0d115"
+    scope: [app/agent.py, app/__init__.py]
+  issued:
+    by: A2AS.org
+    at: '2026-02-11T16:41:38Z'
+    url: https://a2as.org/certified/agents/derrickchwong/gemini-cli-on-adk
+  signatures:
+    digest: sha256:qcUx_PVm12hGeG5Cdxa3PrLXcmOm7dnWPG4-b9ZVYO8
+    key: ed25519:AYa4RPyuVevb7FlYTz57GVfe2Zvq6a8ATRMdiF5z3Z8
+    sig: ed25519:Mw8zDVI11HbAh4NsErwG4yja9ebGzYT0v5es39bTo-yuov1Dcj0TywVyf-YN2kCbSX_zs17HiN9aHL_YKP98Bg
+
+agents:
+  root_agent:
+    type: instance
+    models: [gemini-2.5-pro]
+    tools: [gemini_cli]
+    params:
+      name: root_agent
+      instruction: ['You are a world class Software Developer and you have a very powerful tool - Gemini CLI to help analyze
+          code, generating test plan, generating unit tests, etc.', The codebase is cloned from a GitHub repository and stored
+          on /tmp directory., Always use the Gemini CLI tool to analyze the codebase and complete the user's request.]
+
+models:
+  gemini-2.5-pro:
+    type: literal
+    agents: [root_agent]
+
+tools:
+  gemini_cli:
+    type: function
+    agents: [root_agent]
+    params:
+      description: |-
+        Executes the Gemini CLI.
+
+        Args:
+            task: The task to pass to Gemini CLI, eg: explain this codebase, generate a test plan, etc.
+            github_url: GitHub URL to clone and analyze.
+
+        Returns:
+            The response from the Gemini CLI.
+
+imports:
+  Agent: google.adk.agents.Agent
+  auth: google.auth
+  os: os
+  requests: requests
+  root_agent: app.agent.root_agent
+  subprocess: subprocess
+
+functions:
+  gemini_cli:
+    type: sync
+    module: app.agent
+    args: [task, github_url]
+    params:
+      returns: str
+  get_project_id:
+    type: sync
+    module: app.agent
+
+networks:
+  metadata.google.internal:
+    type: api
+    actions: [GET]
+    urls: [/computeMetadata/v1/project/project-id]
+    protocols: [http]
+    ports: ["80"]
+    params:
+      caller: [get_project_id]