Breaking

Swarms publishes swarms-rs 0.3.0 with OpenRouter, AnyModel, and agent handoffs

September 29, 2026 at 17:00 EDT

AI Agents
Open Source
Software Dev & Coding

Swarms has published swarms-rs 0.3.0 and swarms-macro 0.2.0 on crates.io, describing the pair as the largest release yet of its Rust multi-agent framework. The update adds an OpenRouter provider, an AnyModel type that selects a provider from a model-name string, sub-agents, agent handoffs, and typed tool results, and it fixes deadlocks, hidden failures, and broken tool schemas that the project says affect 0.2.1.

29 Sep 2026 · Swarms

Largest Rust release: OpenRouter, handoffs, typed tools

swarms-rs 0.3.0 and swarms-macro 0.2.0 put one model-name string, sub-agents, and handoffs into the Rust agent framework, and close silent failures left in 0.2.1.

Agent ID generation, drawn to scale

One block is about 37 nanoseconds. The tall column is the old path; the single block is the new path.

931 ns

Before · 0.2.1 path

37 ns

Now · fast-rng

About 25 times less time per ID. Building an agent also moved from 3.9 µs to 3.1 µs, roughly 21% faster.

0.3.0

swarms-rs on crates.io

1.88

Minimum Rust version

409

Tests in the suite

New OpenRouter examples

How a name becomes a running agent

1 · Model string

Example: anthropic/claude-opus-5-5

→

2 · AnyModel

Picks the provider and its API key

→

3 · Collaborate

Sub-agent returns; handoff transfers

What teams gain

One key for many labs, typed tool results, a router on any provider, and Claude replies that include thinking blocks.

What an upgrade hits

Rust 1.88, optional temperature, new content variants, and only the first handoff in a turn. One router still shares a model type unless every agent is AnyModel.

0.2.1 could report success when every model call failed

Deadlocks in the batch executor, multi-task runs, and concurrent use of one agent are fixed. run() now errors if the first loop fails every attempt, and the Anthropic default is claude-opus-5-5.

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