Playwright MCP surface down: reconnect fails with Bad Request on notifications/initialized #1051

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opened 2026-08-19 04:32:02 +00:00 by coilyco-ops-gaming · 0 comments

coilyco-ops-gaming commented

2026-08-19 04:32:02 +00:00

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The playwright/browser MCP surface is down at the transport layer. A browser_navigate call to https://example.com failed with:

mcp-beaver: upstream MCP session is closed (reconnect also failed: reconnect upstream MCP "http://127.0.0.1:8931/mcp": sending "notifications/initialized": Bad Request)

The failure happens on reconnect before any tool call, so no navigation occurred and nothing was read. A retry is expected to fail identically, since the failed reconnect is part of the reported error.

The signature matches the moxn transport failures (#1026, #1038) - Bad Request on notifications/initialized - but on a different surface: the playwright wrapper's upstream at 127.0.0.1:8931. Whether that is a shared root cause (credential or wrapper session state) is not confirmed from this lane.

Blocker: the browser surface is unusable, so questions needing a live page cannot be answered until the wrapper's upstream session is restored. Operator: whoever runs the playwright MCP wrapper.

The playwright/browser MCP surface is down at the transport layer. A browser_navigate call to https://example.com failed with: `mcp-beaver: upstream MCP session is closed (reconnect also failed: reconnect upstream MCP "http://127.0.0.1:8931/mcp": sending "notifications/initialized": Bad Request)` The failure happens on reconnect before any tool call, so no navigation occurred and nothing was read. A retry is expected to fail identically, since the failed reconnect is part of the reported error. The signature matches the moxn transport failures (#1026, #1038) - Bad Request on notifications/initialized - but on a different surface: the playwright wrapper's upstream at 127.0.0.1:8931. Whether that is a shared root cause (credential or wrapper session state) is not confirmed from this lane. Blocker: the browser surface is unusable, so questions needing a live page cannot be answered until the wrapper's upstream session is restored. Operator: whoever runs the playwright MCP wrapper.

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coilyco-gaming/sirens-echo#1051

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