% git clone https://github.com/google/A2A
Cloning into 'A2A'...
remote: Enumerating objects: 320, done.
remote: Counting objects: 100% (90/90), done.
remote: Compressing objects: 100% (71/71), done.
remote: Total 320 (delta 31), reused 29 (delta 18), pack-reused 230 (from 2)
Receiving objects: 100% (320/320), 1.86 MiB | 20.21 MiB/s, done.
Resolving deltas: 100% (73/73), done.
%
cd A2A/samples/js
% cd A2A/samples/js
js %
README.mdに記載されてい内容を確認します。マークダウンなのでブラウザからA2A/samples/jsを参照します。
% npm install genkit
npm warn deprecated @types/handlebars@4.1.0: This is a stub types definition. handlebars provides its own type definitions, so you do not need this installed.
added 401 packages, and audited 402 packages in 9s
44 packages are looking for funding
run `npm fund` for details
found 0 vulnerabilities
js %
js % npm run agents:coder
> a2a-samples-js@0.1.0 agents:coder
> npx tsx src/agents/coder/index.ts
[CoderAgent] Server started on http://localhost:41241
[CoderAgent] Press Ctrl+C to stop the server
A2A Server listening on port 41241 at path /
js % npm run a2a:cli
> a2a-samples-js@0.1.0 a2a:cli
> npx tsx src/cli.ts
A2A Terminal Client
Agent URL: http://localhost:41241
Attempting to fetch agent card from: http://localhost:41241/.well-known/agent.json
✓ Agent Card Found:
Name: Coder Agent
Description: An agent that generates code based on natural language instructions and streams file outputs.
Version: 0.0.1
Starting Task ID: fe3dd9e3-0bf2-4710-b2cb-b0032fafe427
Enter messages, or use '/new' to start a new task.
Coder Agent > You:
Coder Agent > You: に"Write a python function to calculate fibonacci numbers."を入力します。
Enter messages, or use '/new' to start a new task.
Coder Agent > You: Write a python function to calculate fibonacci numbers.
Sending...
Coder Agent [11:00:50]: ⏳ Status: working
Part 1: 📝 Text: Generating code...
Coder Agent > You:
Coder Agent [11:00:55]: 📄 Artifact Received: fibonacci.py (Index: 0)
Part 1: 📝 Text: # This file contains a function to calculate Fibonacci numbers iteratively.
def fibonacci(n: int) -> int:
"""
Calculates the nth Fibonacci number iteratively.
Args:
n: The position in the Fibonacci sequence (non-negative integer).
Returns:
The nth Fibonacci number. Returns 0 for n <= 0.
"""
if n <= 0:
return 0
elif n == 1:
return 1
else:
a, b = 0, 1
# Iterate n-1 times because we already have the first number (b=1 for n=1)
for _ in range(n - 1):
a, b = b, a + b
return b
# Example usage (optional):
# print(fibonacci(0)) # Output: 0
# print(fibonacci(1)) # Output: 1
# print(fibonacci(10)) # Output: 55
# print(fibonacci(20)) # Output: 6765
Coder Agent [11:00:55]: ✅ Status: completed
Part 1: 📝 Text: Generated files: fibonacci.py
SSE stream finished for method tasks/sendSubscribe.
--- End of response for this input ---
Coder Agent > You:
% npm run agents:coder
> a2a-samples-js@0.1.0 agents:coder
> npx tsx src/agents/coder/index.ts
[CoderAgent] Server started on http://localhost:41241
| /* | |
| * Agent Card | |
| * https://google.github.io/A2A/#/documentation?id=agent-card-1 | |
| */ | |
| declare | |
| l_url varchar2(200); | |
| l_response clob; | |
| e_api_call_failed exception; | |
| begin | |
| -- Agent CardのURL | |
| l_url := :G_ENDPOINT || '/.well-known/agent.json'; | |
| apex_debug.info('endpoint = %s', l_url); | |
| apex_web_service.set_request_headers('Content-Type', 'application/json'); | |
| l_response := apex_web_service.make_rest_request( | |
| p_url => l_url | |
| ,p_http_method => 'GET' | |
| ); | |
| if apex_web_service.g_status_code <> 200 then | |
| raise e_api_call_failed; | |
| end if; | |
| select json_serialize(l_response returning clob pretty) into :P1_AGENT_CARD; | |
| end; |
| declare | |
| l_url varchar2(200); | |
| /* | |
| * tasks/send | |
| */ | |
| l_request clob; | |
| l_task json_object_t; | |
| l_id number; | |
| l_params json_object_t; | |
| l_params_id varchar2(32); | |
| l_guid varchar2(36); | |
| l_message json_object_t; | |
| l_parts json_array_t; | |
| l_part json_object_t; | |
| e_api_call_failed exception; | |
| /* | |
| * response | |
| */ | |
| l_response clob; | |
| l_response_json json_object_t; | |
| l_result json_object_t; | |
| l_artifacts json_array_t; | |
| l_artifact json_object_t; | |
| /* | |
| * GUIDを3262b5fd-c7fa-faa8-e063-0200590aca0eの形式で取得する。 | |
| */ | |
| function get_guid return varchar2 | |
| as | |
| l_guid varchar2(32); | |
| l_formatted_guid varchar2(36); | |
| begin | |
| l_guid := lower(rawtohex(sys_guid())); | |
| l_formatted_guid := apex_string.format( | |
| '%s-%s-%s-%s-%s' | |
| ,substr(l_guid, 1, 8) | |
| ,substr(l_guid, 9, 4) | |
| ,substr(l_guid, 13, 4) | |
| ,substr(l_guid, 17, 4) | |
| ,substr(l_guid, 21) | |
| ); | |
| return l_formatted_guid; | |
| end get_guid; | |
| begin | |
| l_url := :G_ENDPOINT; | |
| apex_debug.info('endpoint = %s', l_url); | |
| /* | |
| * Send a Task | |
| * https://google.github.io/A2A/#/documentation?id=send-a-task | |
| */ | |
| l_task := json_object_t(); | |
| l_id := 1; | |
| l_task.put('jsonrpc','2.0'); | |
| l_task.put('id', l_id); | |
| l_task.put('method', 'tasks/send'); | |
| l_params := json_object_t(); | |
| l_guid := get_guid(); | |
| l_params.put('id', l_guid); | |
| l_message := json_object_t(); | |
| l_message.put('role', 'user'); | |
| l_parts := json_array_t(); | |
| l_part := json_object_t(); | |
| l_part.put('type', 'text'); | |
| l_part.put('text', :P1_TASK); | |
| l_parts.append(l_part); | |
| l_message.put('parts', l_parts); -- Send a Taskの例にはdataとなっているがpartsが正しい。 | |
| l_params.put('message', l_message); | |
| l_params.put('metadata', json_object_t()); -- empty object | |
| l_task.put('params', l_params); | |
| l_request := l_task.to_clob(); | |
| apex_debug.info(l_request); | |
| apex_web_service.set_request_headers('Content-Type', 'application/json'); | |
| l_response := apex_web_service.make_rest_request( | |
| p_url => l_url | |
| ,p_http_method => 'POST' | |
| ,p_body => l_request | |
| ); | |
| if apex_web_service.g_status_code <> 200 then | |
| raise e_api_call_failed; | |
| end if; | |
| /* | |
| * responseからartifactを取り出す。 | |
| */ | |
| l_response_json := json_object_t(l_response); | |
| l_result := l_response_json.get_object('result'); | |
| l_artifacts := l_result.get_array('artifacts'); | |
| apex_debug.info('artfifacts = %s', l_artifacts.to_clob()); | |
| -- 今は最初のartifactだけを取り出す。 | |
| l_artifact := treat(l_artifacts.get(0) as json_object_t); | |
| l_parts := l_artifact.get_array('parts'); | |
| apex_debug.info('parts in first artifact = %s', l_parts.to_clob()); | |
| -- 最初のpartを取り出す。 | |
| l_part := treat(l_parts.get(0) as json_object_t); | |
| apex_debug.info('first part in first artifact = %s', l_part.to_clob()); | |
| -- partはtext決め打ちで取り出す。 | |
| :P1_RESPONSE := l_part.get_string('text'); | |
| end; |
[CoderAgent] Server started on http://localhost:41241
[CoderAgent] Press Ctrl+C to stop the server
A2A Server listening on port 41241 at path /
[[Task 3262b5fd-c805-faa8-e063-0200590aca0e] Created new task and history.
[CoderAgent] Emitting completed file (index 0): fib
[CoderAgent] Emitting final file (index 1): fibonacci.py
[Task 3262b5fd-c807-faa8-e063-0200590aca0e] Created new task and history.
[CoderAgent] Emitting final file (index 0): fibonacci.py
[Task 3262b5fd-c80a-faa8-e063-0200590aca0e] Created new task and history.
[CoderAgent] Emitting final file (index 0): fibonacci.py