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feat: add max_tool_concurrency to core Agent and restore compatibility aliases - #366
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…oads Bring back bub.tape, bub.tools, bub.store, bub.sidecars, bub.builtin.commands and bub.builtin.context as aliases of their bub.core modules, and keep the LlmCallRequest / LlmCallResult / LlmCallDecision names in bub.hooks.interception. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Limit how many tool calls from one model response run at once. ToolExecutor holds the limiter: a Semaphore, or nullcontext when unlimited. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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agent = Agent(model=model, tools=[...], max_tool_concurrency=2) Limit how many tool calls from one model response run at once. `None` (the default) runs them all concurrently; `1` runs them one at a time, in order; values below 1 raise ValueError. `ToolExecutor` takes `max_concurrency` and holds the limiter: an `asyncio.Semaphore`, or `nullcontext()` when unlimited.
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What changed and why
Two focused commits:
1.
fix:restore compatibility aliases0.6.0a2 removed modules and names that plugins written against 0.5.x / 0.6.0a1 still import. This restores them as aliases:
sys.moduleslike 0.6.0a1 did, sobub.tape is bub.core.tape:bub.tape,bub.tools,bub.store,bub.sidecars→bub.core.*bub.builtin.commands,bub.builtin.context→bub.core.commands,bub.core.contextbub.hooks.interception.LlmCallRequest/LlmCallResult/LlmCallDecision→LLMCall*. This is where plugins import them from;bub.coregets no aliases.The four top-level aliases need only the kernel's dependencies.
2.
feat:max_tool_concurrencyonbub.core.AgentNone(the default) keeps today's behavior: all calls run concurrently.1runs them one at a time, in order. Values below 1 raiseValueError.ToolExecutorgets amax_concurrencyargument and keeps the limiter on the instance: anasyncio.Semaphore, ornullcontext()when unlimited. The agent creates one executor per step, so the limit applies within one model response.Impacted modules
bub.core.agent,bub.core.tools,bub.hooks.interception, the new alias modules,tests/test_compat_aliases.py,tests/test_core_agent.py, SDK docs (en + zh-cn).Verification
uv run ruff check src tests: cleanuv run mypy src: cleanuv run pytest -q: 660 passed, 1 skippedNone/2/1, and calls still start in order🤖 Generated with Claude Code