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Sweep 28 Aug 2026 · 16:06Z Build v2.1.251 479 read Stable v2.1.236 Latest v2.1.251 Next v2.1.251 Feeds RSS JSON llms.txt

DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

Reference / Environment variables

CLAUDE_CODE_SESSION_ACCESS_TOKEN

A Claude Code environment variable, read out of the shipped bundle. It has been in the build since v2.1.138, including the newest one read.

What it is

Remote settings can now supply many more environment variables, including auth tokens and home directory paths.

Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.223.

Presence across releases

ReleasesReadingDeclared typeDefault
2.1.245 – 2.1.251 6 releases never mined — —
2.1.160 – 2.1.243 75 releases in the build str —
2.1.138 – 2.1.159 20 releases in the build — —

A row reading never mined is a release with no archived bundle behind it. Nothing was read out of it, so nothing here says whether the name was in it. A declared type or a default is only ever what that release's own bundle stated.

Changelog entries naming it

  1. v2.1.224self-hosted-runner decode-token inspects a session token, verifying it by default

    decode-token prints a session token's claims, verifying signature and expiry by default.

    named in this entry

  2. v2.1.223Remote-settings env allowlist widened

    Remote settings can now supply many more environment variables, including auth tokens and home directory paths.

    named in this entry

Documentation pages

A reference table page is one whose own table defines this name, and it is where the description above came from. A page that mentions it carries the name somewhere in its text and may say nothing about it at all. Every page carrying it.

Names beside it

Every environment variable in the inventory starting claude_code_session, up to twelve of them.

CLAUDE_CODE_SESSION_Two env vars let background dispatchers inherit your plan and rate tier without an API call. never mined CLAUDE_CODE_SESSION_IDSkills from your claude.ai account can load as a source, but only if you set the sync env var. 2.1.138 CLAUDE_CODE_SESSION_KINDTwo env vars let background dispatchers inherit your plan and rate tier without an API call. 2.1.138 CLAUDE_CODE_SESSION_LOGNo description from anybody. 2.1.138 CLAUDE_CODE_SESSION_NAMEA blank CLAUDE_CODE_SESSION_NAME now falls back to the directory-derived name. 2.1.138 CLAUDE_CODE_SESSIONEND_HOOKS_TIMEOUT_MSNonsense values in retry, MCP output and hook timeout env vars now fall back to defaults. 2.1.138

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 environment variable does. All environment variables.