swarm-configuration

Agent Building

How `max_env_worker` caps the "Running Episodes" gauge, and how `AgentJetJob` relates to the YAML config.

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Running-episodes cap

The Running Episodes (Episodes: N) number in swarm_overwatch is bounded by the engine-side max_env_worker (set on the job config, e.g. CocktailV2Config.max_env_worker, then forwarded into AgentJetJob and read at ajet/backbone/trainer_verl.py as max_parallel). In ajet/task_rollout/native_parallel_worker.py::rollout_swarm, the engine spawns ceil(max_env_worker / grpo_n) * grpo_n long-lived worker threads, each looping register_episode → wait-for-claim → repeat, so the total in-flight episodes (summed across all swarm clients) cannot exceed that count. total_batch_size, per-client max_env_worker, grpo_n, and the number of clients do not raise this cap , to lift it, raise the engine's max_env_worker (keep it divisible by grpo_n) and restart.

AgentJetJob ↔ YAML

When using Agentjet Swarm, please first use AgentJetJob as the primary configuration interface.

If there are fields you want to set that are not exposed as AgentJetJob kwargs, use yaml as the primary configuration interface.

In general, you should place most configuration in a place (either AgentJetJob or yaml), and MUST NOT place configuration here and there at the same time.

AgentJetJob (ajet/copilot/job.py) is a thin YAML overlay, not a separate config system. On __init__ it loads a base YAML (default ajet/default_config/ajet_swarm_default.yaml, or whatever path is passed via base_yaml_config=) into self.config, then walks an overrides table that maps each constructor kwarg to a deep YAML key (e.g. max_env_worker → ajet.rollout.max_env_worker, batch_size → ajet.data.train_batch_size, model → ajet.model.path). For each entry: if the kwarg is None the YAML value wins; if non-None it overwrites the YAML value in-place. Anything not listed in overrides (e.g. rollout.temperature, rollout.multi_turn, trainer_common.save_freq) has no kwarg shortcut and must be set by mutating ajet_job.config.ajet.* directly after construction , this is what build_cocktail_ajet_job does in the cocktail_rl_v2 tutorial. dump_job_as_yaml(path) serialises the merged result back out, and that dumped YAML is the file the engine subprocess actually consumes. Net effect: YAML is the source of truth for defaults; AgentJetJob kwargs are sparse overrides; post-construction attribute writes are the escape hatch for fields without a kwarg.