adk-agent-builder

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Read only the reference that matches the task. Loading the whole tree costs context and buries the part that matters.

Every API below was checked against

google-adk

2.6.2. If a symbol is missing at runtime, read the source under

src/google/adk/

rather than guessing a neighbouring name.

仅阅读与任务匹配的参考资料。加载整个目录树会消耗上下文，并掩盖关键内容。

以下每个 API 均已针对

google-adk

2.6.2 进行验证。如果运行时缺少某个符号，请阅读

src/google/adk/

下的源代码，而不要猜测相近的名称。

Task	Reference
First agent, environment, `adk` CLI	getting-started.md
Which import path is the canonical one	import-paths.md
The rules that cause most runtime failures	best-practices.md

tool-catalog.md — function tools, MCP, OpenAPI, Google API toolsets, built-in tools, custom
```
BaseTool
```
and
```
BaseToolset
```
.
function-nodes.md — plain functions as nodes: parameter resolution, generators,
```
node_input
```
typing rules.
llm-agent-nodes.md — an
```
LlmAgent
```
used as a workflow node: output types, instruction templates,
```
output_schema
```
, auto-wrapping behavior.
task-mode.md —
```
mode='task'
```
and
```
mode='single_turn'
```
delegation with schema-validated input and output.

routing-and-conditions.md — routed edges, dict routing maps, default routes, self-loops, revision loops.
parallel-and-fanout.md — fan-out edges,
```
JoinNode
```
fan-in,
```
parallel_worker=True
```
list processing.
dynamic-nodes.md — scheduling nodes at runtime with
```
ctx.run_node()
```
and imperative workflow construction.
human-in-the-loop.md —
```
RequestInput
```
, resume behavior, resumable vs replayed sessions.
advanced-patterns.md — nested workflows, retries, custom
```
BaseNode
```
subclasses, graph validation rules.
multi-agent.md — chat-transfer hierarchies, and the deprecated
```
SequentialAgent
```
/
```
LoopAgent
```
/
```
ParallelAgent
```
shells that
```
Workflow
```
replaces.

state-and-events.md — the
```
Context
```
object,
```
Event
```
fields, and how state flows between nodes.
session-and-state.md — session services, artifacts, memory, and state key scoping.
callbacks-and-plugins.md — the six agent callbacks and app-level plugins.
testing.md —
```
pytest
```
with
```
InMemoryRunner
```
, faking a model, asserting on node output.