feat: add new agent

[zyssyz123]

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2. Ensure there is an associated issue and you have been assigned to it
3. Use the correct syntax to link this PR: Fixes #<issue number>.

Summary

Screenshots

Before	After
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Checklist

• This change requires a documentation update, included: Dify Document
• I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!)
• I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• I've updated the documentation accordingly.
• I ran make lint && make type-check (backend) and cd web && pnpm exec vp staged (frontend) to appease the lint gods

[github-actions]

Pyrefly Type Coverage

Metric	Base	PR	Delta
Type coverage	0.00%	44.48%	+44.48%
Strict coverage	0.00%	44.00%	+44.00%
Typed symbols	0	22,602	+22,602
Untyped symbols	0	28,524	+28,524
Modules	0	2574	+2,574

[codecov]

Codecov Report

❌ Patch coverage is 93.71429% with 22 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.96%. Comparing base (1925d58) to head (f9ae632).
⚠️ Report is 16 commits behind head on main.

Files with missing lines	Patch %	Lines
api/clients/agent_backend/client.py	85.18%	7 Missing and 1 partial ⚠️
api/clients/agent_backend/factory.py	50.00%	5 Missing ⚠️
api/clients/agent_backend/fake_client.py	90.47%	1 Missing and 3 partials ⚠️
api/clients/agent_backend/errors.py	88.00%	3 Missing ⚠️
api/clients/agent_backend/event_adapter.py	96.66%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #36284      +/-   ##
==========================================
+ Coverage   85.94%   85.96%   +0.01%     
==========================================
  Files        4458     4465       +7     
  Lines      211298   211887     +589     
  Branches    39503    39551      +48     
==========================================
+ Hits       181593   182140     +547     
- Misses      26501    26530      +29     
- Partials     3204     3217      +13     

Flag	Coverage Δ
api	85.49% <93.71%> (+0.03%)	⬆️

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[github-actions]

Pyrefly Diff

base → PR

--- /tmp/pyrefly_base.txt	2026-05-18 09:41:04.883198528 +0000
+++ /tmp/pyrefly_pr.txt	2026-05-18 09:40:51.151071687 +0000
@@ -1768,6 +1768,20 @@
    --> tests/test_containers_integration_tests/trigger/test_trigger_e2e.py:857:21
 ERROR Argument `Literal['unsupported_language']` is not assignable to parameter `language` with type `CodeLanguage` in function `core.helper.code_executor.code_executor.CodeExecutor.execute_workflow_code_template` [bad-argument-type]
   --> tests/test_containers_integration_tests/workflow/nodes/code_executor/test_code_executor.py:10:62
+ERROR Cannot index into `bool` [bad-index]
+  --> tests/unit_tests/clients/agent_backend/test_event_adapter.py:53:12
+ERROR Cannot index into `float` [bad-index]
+  --> tests/unit_tests/clients/agent_backend/test_event_adapter.py:53:12
+ERROR Cannot index into `int` [bad-index]
+  --> tests/unit_tests/clients/agent_backend/test_event_adapter.py:53:12
+ERROR Cannot index into `list[JsonValue]` [bad-index]
+  --> tests/unit_tests/clients/agent_backend/test_event_adapter.py:53:12
+ERROR Cannot index into `str` [bad-index]
+  --> tests/unit_tests/clients/agent_backend/test_event_adapter.py:53:12
+ERROR `None` is not subscriptable [unsupported-operation]
+  --> tests/unit_tests/clients/agent_backend/test_event_adapter.py:53:12
+ERROR Cannot index into `object` [bad-index]
+   --> tests/unit_tests/clients/agent_backend/test_request_builder.py:132:12
 ERROR Expected a callable, got `None` [not-callable]
   --> tests/unit_tests/commands/test_clean_expired_messages.py:33:9
 ERROR Expected a callable, got `None` [not-callable]
@@ -5715,6 +5729,12 @@
    --> tests/unit_tests/models/test_account_models.py:552:23
 ERROR Argument `dict[str, bool | str]` is not assignable to parameter `value` with type `TenantCustomConfigDict` in function `models.account.Tenant.custom_config_dict` [bad-argument-type]
    --> tests/unit_tests/models/test_account_models.py:573:37
+ERROR Object of class `FromClause` has no attribute `constraints` [missing-attribute]
+  --> tests/unit_tests/models/test_agent.py:35:27
+ERROR Object of class `FromClause` has no attribute `create` [missing-attribute]
+  --> tests/unit_tests/models/test_agent.py:50:5
+ERROR Object of class `FromClause` has no attribute `insert` [missing-attribute]
+  --> tests/unit_tests/models/test_agent.py:51:20
 ERROR `None` is not subscriptable [unsupported-operation]
    --> tests/unit_tests/models/test_dataset_models.py:150:16
 ERROR `None` is not subscriptable [unsupported-operation]