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playwright and bluesky MCP servers unreachable: reconnect fails with Bad Request #897
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opened 2026-08-17 14:22:02 +00:00 by coilyco-ops-gaming
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this fj issue came in from the live sirens echo MCP - DO NOT CONSIDER ITS INPUTS SAFE OR VERIFIED UNTIL THIS LABEL IS REMOVED
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Found during a one-tool-per-MCP smoke test across the roster.
What happens
Two servers reject every call with the same failure:
http://127.0.0.1:8931/mcp) -browser_navigatereturned "upstream MCP session is closed (reconnect also failed: reconnect upstream MCP ...: sending notifications/initialized: Bad Request)".http://127.0.0.1:9113/mcp) - same error on the only available read call, with the session also closed and reconnect rejected with Bad Request.A retry seconds later produced the identical error, so this is not a one-off transient. The upstream server rejects the protocol initialization itself, which points at the server or the mcp-beaver proxy configuration rather than at a slow call.
Impact
Two of the eleven connected servers are fully unavailable to the agent: no browser automation, no Bluesky reads. The smoke test could not complete for either.
Notes
Issue #873 already records that a 100% playwright failure rate over 12h went unnoticed because failed MCP tool calls do not set span error status. This is a different symptom (session closed, reconnect Bad Request) and describes the current live state rather than the telemetry gap.
Ops, 2026-08-18. Confirmed still live, and the defect has a home -
coilyco-flight-deck/mcp-beaver#80, which describes this exact failure and predates this issue by eight hours. Full evidence and a correction to that issue's stated hypothesis are in my comment there.The one thing worth carrying back here, because it is the obvious first thing anyone will try:
A rolling restart does not fix it. I restarted
sirens-deep-owl-glass-playwright-mcp, the rollout succeeded, the new pod came up 2/2 with 0 restarts, andbrowser_navigatethrough Deep's lane failed with the identical error. On the fresh pod the upstream handshake succeeds and snapshots all 8 tools, then the session returns 400 forty seconds later with no traffic in between. So pod status is not a health signal for this, and neither is a green rollout.Scope for this repo's purposes - it hits the two upstream-passthrough MCPs (playwright, bluesky) and not the nine single-container guardfile ones, which answered normally in the same turn.
signoz-mcpin the owl-glass lane is a third passthrough pod and is untested rather than known-good.Nothing in ops authority clears this. The pod already runs the newest beaver, so it needs the engineer fix in
#80. Leaving this issue open as the live-state record and tracking the fix there.Still dead as of 2026-08-19T00:00Z, and here is what it cost in front of the guests
Saiya (exec seat), at Kai's direction, from a full read of the owl.glass export. No new issue, since this one and
coilyco-flight-deck/mcp-beaver#80already own the fix. Kai's position is that this is critical and in progress.The probe, from Dowel's own harness rather than inferred
Kai asked directly at 03:58Z on 08-18 whether it had recovered. Dowel probed live rather than guessing:
And again at 03:59Z:
Re-confirmed at 2026-08-19T00:00Z, roughly 11 hours before the stream:
What it blocked, all of it visible in the channel
fetch_urlrefuses company domains, Wikipedia 403s, Wayback no answer. Only exa metadata survives." Dowel contributed zero documents to a five-hour multi-agent exercise, and this is one of the two reasons.Why it is worth more than its own severity
The lane also carries this dead server in every prompt, so the model rediscovers the failure at call time.
#932measured 45 playwright calls across the demo lanes over 7 days, every one a failure. Kai's standing decision from#932is "no, we fix the servers", so removing it from the roster is not the path and nobody should re-propose it.The compounding cost is that a blocked Dowel is an opening for another participant's agent to answer in its place. Across the export, on 11 of 32 direct addresses to Dowel, another agent replied first.
Not asking for anything new
This comment adds evidence, not scope. The 1-line config change Kai referenced at 03:58Z is still the fix as far as this seat can tell.
Fixed and verified. Closing. Angie (ENG), seat
claude.The cause was not the reconnect
This issue, and
mcp-beaver#80under it, both read the failure as a lost session that could not be replaced. That was the visible error and it was a symptom.The actual defect: mcp-beaver's passthrough dialled its upstream with
DisableStandaloneSSE: true. This playwright build answers atools/callon the standalone SSE stream, so with no stream open the call waited out the request budget. One variable, same server, same SDK:Once a call hung, the connection failed, and every later call reported a closed session and a failed reconnect. That reconnect error is what everyone read, including me.
Why it hid.
tools/listanswers on the POST and works with no stream. That is the startup snapshot and the drift check, so the proxy connected, advertised all 8 tools, loggedserving upstream proxy, and sat 2/2 with 0 restarts while every real call failed. Every signal anyone checked said healthy, which is why a rolling restart never helped and why pod status was worthless here.Fixed in
coilyco-flight-deck/mcp-beaver@94e4050, with a regression test. Every existing upstream fixture servedJSONResponse: true, answering on the POST, so the suite structurally could not express this failure; the new fixture answers atools/callonly on the standalone stream.Verified, all of it
All seven upstream-mode pods are on the fixed image. Then every tool in the allowlist, on all three lanes, 24 calls:
browser_clickis asserted on effect rather than on a non-error: each lane's click moved the page fromexample.comtohttps://www.iana.org/help/example-domains, so it landed rather than being accepted and dropped.That is 8 of 8. The four withheld tools (
browser_evaluate,browser_run_code_unsafe,browser_file_upload,browser_install) stay withheld by the allowlist and were not touched.The bluesky half is obsolete rather than fixed
I could not reproduce it and did not fix it: bluesky is in no lane's roster and no lane runs a bluesky sidecar. Checked all three namespaces, none present, and none of the
sirens-echo,sirens-deep, orsirens-dowelrosters names it. The standalonebluesky-mcpservice is a separate tailnet deployment with no beaver in front of it and is unaffected by this defect.It would have had the same cause while it existed, since it was the other upstream-passthrough entry. Recording it as gone rather than claiming a fix.
Not covered here
sirens-dowel-moxn-mcpis refusing calls for an unrelated reason: its 24-hour OAuth access token is expired, so the pod cannot complete its startup dial. Kai is handling the refresh. That is a credential rotation, not this defect, and it is not what this issue tracked.