tengu_mcp_server_connection_succeeded
A Claude Code feature flag, read out of the shipped bundle. No mined inventory carries it: everything below comes from what this site has written about it.
MCP debug output now shows which protocol version and path a server connection used.
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.221.
In the changelogs
4Releases whose published page names tengu_mcp_server_connection_succeeded.
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v2.1.268
MCP connection telemetry now records server instructions length/truncation
MCP connection telemetry now records the length of a server's instructions and whether they were truncated
gate cited by this entry, found in this entry's text
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v2.1.265
MCP telemetry now records negotiated legacy SSE transport
MCP connection telemetry now records when a connection fell back to the older SSE transport
gate cited by this entry
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v2.1.224
MCP events forwarded to Datadog, with identifying fields removed and a per-server cap
MCP events are forwarded for logging with identifying fields stripped, and skipped entirely if analytics are off.
gate cited by this entry, found in this entry's text
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v2.1.221
Connection telemetry gains negotiation and protocol fields
MCP debug output now shows which protocol version and path a server connection used.
gate cited by this entry, found in this entry's text
Gate readings
0No release here has a gate table behind it for this flag. Most published releases have none at all: the readings exist only for versions the pipeline captured flag state on.
First cited
0No release's published evidence quotes this name. The ledger indexes the Evidence lines of every changelog on this site, so this says nobody here has ever quoted it; it says nothing about how old the name is.
Presence across releases
0The miner has never read a build containing this name. It is here because a changelog entry of ours names it, which is evidence that it existed and not evidence of which releases carried it. The inventory starts at v2.1.138 and everything older than that was never mined.
Read out of the published npm bundle release by release, and out of Anthropic's own documentation as this site captured it. Nothing on this page is a description anybody here wrote about what the feature flag does. All feature flags.