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Sweep 19 Sep 2026 · 02:36Z Build v2.1.278 500 read Stable v2.1.267 Latest v2.1.278 Next v2.1.278 Feeds RSS JSON llms.txt Unofficial
Claude Code v2.1.274 ·

MCP catalog lookup source changed

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MCP catalog lookups now read from a served catalog cache instead of a host-keyed source

TierUnder the hoodhow much it should matter to you
Useful1my rating, 1 to 5
Signal1worth watching, 1 to 5
AreaMCPwhat it touches
KindInternal Changesin v2.1.274,
Under the hood

MCP catalog lookups now read from a served catalog cache instead of a host-keyed source

What

The internal function that looks up the MCP (Model Context Protocol) catalog now returns its data from a servedCatalogByKey source instead of the previous host-based lookup.

Why

This changes where Claude Code's MCP catalog data comes from internally; the finding does not specify what practical difference this makes for users.

How sure we are
Something disagreesSomething we can check disagrees with this entry, or the writer said they could not settle it.
The writer flagged doubtWhat effect this source change has on behavior visible to the user is not specified.

See this entry in the whole of v2.1.274 →