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Sweep 22 Oct 2026 · 21:04Z Build v2.1.309 528 read Stable v2.1.308 Latest v2.1.309 Next v2.1.309 Feeds RSS JSON llms.txt llms-full.txt Unofficial
Home / Reference / Settings keys

session_id

setting in the build JSON

A Claude Code settings key, read out of the shipped bundle. It has been in the build since v2.1.309, including the newest one read.

Analytics ids are now filtered to safe characters before being sent, with no change you'll see.

Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.219.

First seen v2.1.309 22 Oct 2026
Last seen v2.1.309 22 Oct 2026
Builds1 / 150on this box, as of v2.1.309
Written about v1.0.71 first named in a changelog, 7 Aug 2025
v2.1.309in the build not in the build never minedv2.1.309

In the changelogs

22

Releases whose published page names session_id.

  1. v2.1.295
    mcp serve gains a session tunnel mode and can return tool output

    claude mcp serve has a new --session-tunnel mode that connects through a relay, and can return tool output and relay permission asks

    found in this entry's text

  2. v2.1.290
    Creating a cloud session now reports what was not applied

    The cloud session create command now prints a notice and a list of what was not applied, also adding both to its JSON output

    found in this entry's text

  3. v2.1.277
    session_id telemetry suppressed for remote-trigger entrypoints

    Telemetry no longer records a session_id when Claude Code was started via a remote trigger

    found in this entry's text

  4. v2.1.269
    rename_session now validates session_id and records host-authored renames

    rename_session now checks the session id and logs host-initiated renames separately

    found in this entry's text

  5. v2.1.269
    New agent-SDK control-request: rename_session

    SDK control-request rename_session refined with remote/host distinction and a get_memory_dialog request added

    found in this entry's text

  6. v2.1.265
    New CLI flag --attach-serve for desktop app helper sessions

    New hidden --attach-serve flag lets the desktop app attach a helper session to a bound cloud session

    found in this entry's text

  7. v2.1.246
    Assistant messages tell you which prompt they answer

    SDK replies now carry the uuid of the prompt they answer, on the first frame.

    found in this entry's text

  8. v2.1.234
    Permission mode changes are announced on the stream-json output

    Scripted sessions now get a stream-json status message whenever the permission mode changes.

    found in this entry's text

  9. v2.1.232
    Per-turn attribution key sent as tk, and tk is now a reserved metadata name

    tk is now a reserved metadata name and stripped from your extra metadata or body.

    found in this entry's text

  10. v2.1.229
    Whitespace-only prompts are rejected for --cloud and --environment

    Whitespace-only prompts on --cloud and --environment are rejected instead of sent empty.

    found in this entry's text

  11. v2.1.228
    Device tools reject calls tagged with someone else's cloud session

    Tools on your machine refuse calls from a cloud session other than the one being served.

    found in this entry's text

  12. v2.1.227
    Scheduled cloud routines can show their past runs and logs

    Claude can list a scheduled cloud routine's recent runs and read one run's latest log events.

    found in this entry's text

  13. v2.1.227
    Routines tool can list past runs and fetch a run log

    Claude can read a routine's past runs and detailed run log, but a server flag gates it.

    found in this entry's text

  14. v2.1.224
    --teleport and --cloud show up in claude --help

    --teleport and --cloud now show up in claude --help.

    found in this entry's text

  15. v2.1.224
    Create a cloud session without a terminal

    Create a cloud session straight from the command line with --environment and a prompt, optionally as JSON.

    found in this entry's text

  16. v2.1.224
    Runner collects metrics from its child sessions and re-exports them

    Set OTEL_METRICS_EXPORTER=prometheus and child sessions report through the runner, giving one scrape target per machine.

    found in this entry's text

  17. v2.1.219
    Telemetry ids validated before sending

    Analytics ids are now filtered to safe characters before being sent, with no change you'll see.

    found in this entry's text

  18. v2.1.204

    found in this entry's text

  19. v2.1.193
    model_refusal_no_fallback SDK Event

    found in this entry's text

  20. v2.1.181

    found in this entry's text

  21. v2.1.91
  22. v1.0.71
    StatusLine Display

    found in this entry's text

First cited

7

The earliest release whose published evidence quoted session_id was v2.1.224, 7 Aug 2026. That is the oldest release this project wrote about it, so it is a floor on the name's age and not the release that introduced it. It is not a presence reading: which builds carried the name is the table below.

ReleaseDateThe span that was quoted
v2.1.2247 Aug 2026--cloud [description|session_id|url]
v2.1.22710 Aug 2026get_run_log requires session_id
v2.1.22710 Aug 2026get_run_log: GET /v1/code/sessions/{session_id}/events
v2.1.22912 Aug 2026Error: non-interactive --cloud <session_id> requires a prompt (positional or stdin).
v2.1.2658 Sep 2026--attach-serve <session_id>
v2.1.26911 Sep 2026session_id is not the current session

1 further span in the ledger name it. The list above is the earliest first and stops at 6.

Presence across releases

1
BuildsHow manyDatesReading
v2.1.3091 build22 Oct 2026 ◆in the build

Build by build

1

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
v2.1.30922 Oct 2026·addedverdict: added

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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