Claude Code 2.1.x changed the flag's signature to take an *allowlist* of
tagged entries — `server:<name>` for manually-configured MCP servers,
`plugin:<name>@<marketplace>` for plugin channels. PR #25's
`{flag: None}` rendered as a bare `--<flag>` with no value, the CLI
rejected with `argument missing`, and the SDK timed out at `initialize`,
surfacing upstream as `Control request timeout: initialize` (caught
live on workspace dd40faf8 on 2026-05-01 — 100% of A2A turns wedged).
Pass `server:molecule` so the SDK forwards
`--dangerously-load-development-channels server:molecule`. Live-verified
end-to-end: A2A returns coherent replies AND the host claude session
renders inbound canvas messages as `<channel source="molecule" ...>`
tags inline (push UX without inbox poll).
Tests: replace the unconditional `None` pin with a tagged-form pin
that asserts the exact `server:molecule` value, plus a defense-in-depth
test that pins the invariants (non-None, non-empty, contains tag
colon) so any regression to the bare-switch shape fails at unit-test
time instead of surfacing as a live SDK initialize wedge. 38/38 pass.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
The wheel-side push UX gates (capability + instructions, molecule-core
PR #2463) only matter if the host claude CLI is willing to register a
non-allowlisted experimental channel. During the channels research
preview the CLI requires --dangerously-load-development-channels to
bypass its allowlist; without it, every notifications/claude/channel
fired by the inbox bridge arrives at the host and is silently dropped.
claude-agent-sdk forwards arbitrary CLI flags to the spawned subprocess
via ClaudeAgentOptions.extra_args (claude_agent_sdk/_internal/transport/
subprocess_cli.py:340). Wire the flag in unconditionally — the flag is
harmless on builds that already allowlist the capability and required
on builds during the research preview, so there is no version skew to
guard. Remove the line once channels graduate to the default allowlist.
Test pins the wiring with a stubbed ClaudeAgentOptions recorder; runs
in CI without claude_agent_sdk / a2a / molecule_runtime installed via
the same _ensure_module/_ensure_attr pattern as the existing adapter
prevalidate test, but tolerates real packages being present locally.
Verified by injection: removing the extra_args line makes the test
fail with a message naming the missing flag and citing the SDK file
that consumes it.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
