Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add agents/google/adk-docs/routinggit clone --depth 1 https://github.com/google/adk-docsWhat it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00000 | $0.01112 |
| Opus 5 | $0.00000 | $0.00556 |
| Sonnet 5 | $0.00000 | $0.00222 |
| Haiku 4.5 | $0.00000 | $0.00111 |
Grade A, and why
routing scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured yesterday.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 127 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Route between agents
!!! example "Experimental"
Agent routing is experimental and may change in future releases. We welcome
your
[feedback](https://github.com/google/adk-js/issues/new?template=feature_request.md)!
When building agents for different tasks, you can define a routing function that
selects which one handles each invocation at runtime. RoutedAgent provides
this capability, enabling agent fallback on error, A/B testing, planning modes,
and auto-routing by input complexity. If the selected agent fails before
producing any output, the routing function is called again with error context so
it can select a fallback.
RoutedAgent is different from workflow agents like
SequentialAgent or ParallelAgent, which orchestrate multiple agents in a
fixed pattern, and from LLM-driven
delegation, where the
LLM decides which agent to hand off to. With RoutedAgent, you write an
explicit routing function that selects one agent per invocation. For
model-level routing, see Model routing.
How routing works
Both RoutedAgent and RoutedLlm are powered by a shared
routing utility that handles selection and failover.
The router function receives the map of available agents and the current context, and returns the key of the agent to run. It can be synchronous or async:
=== "TypeScript"
```typescript
type AgentRouter = (
agents: Readonly<Record<string, BaseAgent>>,
context: InvocationContext,
errorContext?: { failedKeys: ReadonlySet<string>; lastError: unknown },
) => Promise<string | undefined> | string | undefined;
```
The agents parameter accepts either a Record<string, BaseAgent> with
explicit keys, or an array of agents. If an array is provided, each agent's
name property is used as its key.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- yesterday First seen · 127 lines · 0 tokens per session scan A d8ca3c76bcf0
routing is an agent published in the GitHub repository google/adk-docs (1,479 stars, last pushed 3d ago), licensed Apache-2.0. It costs nothing until one of its globs matches a file; then it loads 1,112 tokens. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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