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Sweep 29 Sep 2026 · 18:10Z Build v2.1.285 506 read Stable v2.1.280 Latest v2.1.285 Next v2.1.285 Feeds RSS JSON llms.txt llms-full.txt Unofficial
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server

setting in the build JSON

A Claude Code settings key, read out of the shipped bundle. It has been in the build since v2.1.284, including the newest one read.

Some MCP server discovery calls are answered from cache, avoiding an extra round trip.

Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.221.

First seen v2.1.284 28 Sep 2026
Last seen v2.1.285 29 Sep 2026
Builds2 / 128on this box, as of v2.1.285
Written about v1.0.18 first named in a changelog, 9 Jun 2025
v2.1.284in the build not in the build never minedv2.1.285

In the changelogs

30

Releases whose published page names server.

  1. v2.1.285
    Apps can ask Claude Code to connect to an MCP server

    Claude Code now handles an mcp.connect request that takes the name of an MCP server

    found in this entry's text

  2. v2.1.285
    plugin install --config can now set options for a plugin's bundled MCP servers

    plugin install --config now accepts server.key values for a plugin's bundled MCP servers, and lists unset options after installing

    found in this entry's text

  3. v2.1.285
    Set a bundled MCP server's own options when installing a plugin

    The plugin install --config option can now set a bundled .mcpb server's own user_config fields, written as <server>.<key>=<value>

    found in this entry's text

  4. v2.1.285
    Risky sandbox grants committed in a repository are now withheld

    With blockReadsOutsideWorkingDirectories on, a repository's allowRead and allowWrite grants are withheld if they are globs, network paths or risky symlinks

    found in this entry's text

  5. v2.1.284
    Files reached through a symlink onto a network share are no longer read

    Claude Code now refuses to read a file through a symlink that leads onto a network share or automount path, and paths it cannot check

    found in this entry's text

  6. v2.1.281
    Device-bound cloud sessions now disallow the device_* MCP tools

    Cloud sessions tied to a device now block the device_bash, device_list_dir, device_stage_files and device_commit_files tools

    found in this entry's text

  7. v2.1.280
    SDK client_composed field description greatly expanded to document skipped attachment behavior

    SDK docs now spell out exactly what client-composed turns skip: file mentions, slash commands, MCP mentions, and attachments

    found in this entry's text

  8. v2.1.269
    Message-history schema gains attached_by field

    Message-history schema gains an optional attached_by: "server" field

    found in this entry's text

  9. v2.1.265
    MCP channel flags require plugin:/server: tagging

    --channels and its development-channels flag now require explicit plugin: or server: tags

    found in this entry's text

  10. v2.1.259
    MCP connect: caching/rejecting the /v1/mcp_servers discover projection

    MCP connections can cache a discovery projection to skip a round trip, discarding and re-probing it if the server rejects it.

    found in this entry's text

  11. v2.1.251
    Eval-authoring guidance now requires mocking MCP servers

    The eval-writing skill now requires stubbing MCP calls so evals never hit real services.

    found in this entry's text

  12. v2.1.242
    plugin eval can mock a plugin's MCP servers, with docs to match

    Plugin evals can swap a plugin's MCP servers for fakes defined in a mocks folder.

    found in this entry's text

  13. v2.1.242
    Clearer errors when a page requests an unavailable MCP server

    A page asking for an unavailable MCP server now gets one of three specific rejections.

    found in this entry's text

  14. v2.1.238
    Proxy refusals no longer look like Anthropic blocking you

    Proxy tunnel refusals now name a CDN, VPN or firewall instead of looking like an Anthropic block.

    found in this entry's text

  15. v2.1.233
    Network path detection now covers /net automount paths

    Automounted /net paths now count as network paths for file reads, writes and attachments.

    found in this entry's text

  16. v2.1.232
    MCP servers that reply badly to the version probe now fall back to legacy instead of failing

    MCP servers that reply oddly to the version probe now fall back to legacy instead of failing.

    found in this entry's text

  17. v2.1.221
    MCP: server/discover answered from the cached projection on the stateless proxy

    Some MCP server discovery calls are answered from cache, avoiding an extra round trip.

    found in this entry's text

  18. v2.1.221
    MCP clients record a negotiated protocol era

    Claude now negotiates a protocol era with MCP servers and only uses the experimental permission channel for older ones.

    found in this entry's text

  19. v2.1.217
    Path Containment Security Overhaul

    found in this entry's text

  20. v2.1.209
    Artifact Runtime Capabilities (MCP)

    found in this entry's text

  21. v2.1.186
  22. v2.1.118
    MCP Tool Hooks (mcp_tool)

    found in this entry's text

  23. v2.1.69
    Remote Control Server Mode

    found in this entry's text

  24. v2.1.69

    found in this entry's text

  25. v2.1.66
    Remote Control Simplified

    found in this entry's text

  26. v2.1.64
    Remote Control Server Mode

    found in this entry's text

  27. v2.1.53
    UNC Network Path Blocking

    found in this entry's text

  28. v2.0.35
    Enhanced UNC Path Detection

    found in this entry's text

  29. v1.0.19
    MCP Resource Support (@mentions)

    found in this entry's text

  30. v1.0.18
    Internal Improvements

    found in this entry's text

First cited

0

No 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

1
BuildsHow manyDatesReading
v2.1.284 – v2.1.2852 builds28 Sep 2026 → 29 Sep 2026 ◆in the build

Build by build

2

One row per release since the first build this name was read out of. Absent means the build was read and the name was not in it, never mined means no bundle for that release was ever archived, and a declared type or a default is only ever what that release's own bundle stated.

BuildDateStateThe record behind it
v2.1.28428 Sep 2026·addedverdict: added
v2.1.28529 Sep 2026·presentverdict: present

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 settings key does. All settings keys.

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