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Sweep 28 Aug 2026 · 00:00Z Build v2.1.250 478 read Stable v2.1.236 Latest v2.1.250 Next v2.1.251 Feeds RSS JSON llms.txt
Reading a new release v2.1.251 Analysing changes · 2/5 Deeper second pass · 0/5 agents 427 findings $12.75 so far

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 / Feature flags

tengu_stone_shell

A Claude Code feature flag, read out of the shipped bundle. It has been in the build since v2.1.212, including the newest one read.

What it is

Rewritten memory rules would make Claude save corrections and environment quirks immediately, before replying.

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

Presence across releases

ReleasesReadingDeclared typeDefault
2.1.245 – 2.1.250 5 releases never mined — —
2.1.212 – 2.1.243 31 releases in the build — bool:false

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.

Gate readings

ReleaseResolvedThis accountAnonymousCompiled default
v2.1.238 Off in both readings off off on
v2.1.232 read on another version Off in both readings off off on
v2.1.224 read on another version Off in both readings off off on
v2.1.219 read on another version Off in both readings off off on
v2.1.212 read on another version Off in both readings off off on

Two arms, because they disagree: this account is the one account this site reads and anonymous is a baseline with no identity attached. A reading says nothing about your account, and off cannot rule out a rollout both readings sit outside of. What these readings can and cannot show.

Changelog entries naming it

  1. v2.1.238The memory-tools gate was renamed, so everyone is back on file-based memory

    The memory-tools switch was renamed, resetting any rollout, so everyone is back on file-based memory.

    gate cited by this entry

  2. v2.1.232Two feature decisions moved onto the shared process config object

    The memory prompt variant and the skill-suggestion rollout are now fields on the process config.

    gate cited by this entry

  3. v2.1.224An auto-generated index of your memory files

    Claude can auto-generate an index of your memory files and feed it in as a source.

    gate cited by this entry

  4. v2.1.219Rewritten memory system prompt

    Rewritten memory rules would make Claude save corrections and environment quirks immediately, before replying.

    gate cited by this entry

  5. v2.1.219Memory subagent's delete permission narrowed

    The memory cleanup agent could only delete plain memory files, never anything with flags or outside the folder.

    gate cited by this entry

  6. v2.1.219Memory truncation warning now covers ordinary memory files

    Oversize memory warnings would finally say something sensible about ordinary files, not just index entries.

    gate cited by this entry

  7. v2.1.219Compact recall/remember summaries in the transcript

    Memory recall notes could show as a compact grouped line in normal sessions, but that view is off.

    gate cited by this entry

  8. v2.1.219Pinned memories are injected into the session

    Adding pinned: true to a memory file's frontmatter would apply it to every session automatically.

    gate cited by this entry

  9. v2.1.212Persistent File-Based Memory (tengu_stone_shell) [Gradual Rollout]

    gate cited by this entry

Documentation pages

None of Anthropic's documentation pages this site has a copy of carries this name.

Names beside it

Every feature flag in the inventory starting tengu, up to twelve of them.

tengu_1p_event_batch_configNo description from anybody. never mined tengu_account_plugins_sync_enabledPlugins you enabled on claude.ai can be pulled to your machine, but only your account server can enable it. never mined tengu_account_skills_sync_enabledSyncing skills from your claude.ai account stays off, but its checks were reshaped for other synced resources too. 2.1.234 tengu_adopt_claimA stale session claim now keeps its entries, marked stale, instead of throwing them away. never mined tengu_adopt_linkAdopting an agent's transcript now hard-links the file, copying only when linking is impossible. never mined tengu_adopt_relinkOn startup, subagent transcripts stored as symlinks are converted to hard links or copies. never mined tengu_advisor_unknown_contentAdvisor output you couldn't see now shows an error or a clear "declined to advise" message. never mined tengu_agent_hooks_origin_untrustedAgents in untrusted folders can no longer define inline MCP servers; trust the project to allow it. never mined tengu_agent_list_attachNo description from anybody. 2.1.138 tengu_agent_proxy_download_queueDownload backlog on the agent proxy is now reported as a telemetry event. never mined tengu_agent_tool_selectedSDK result messages now include a summary of the subagents your session started. never mined tengu_agent_worktree_cwd_escape_blockedAgent commands now have a concrete worktree boundary, so escapes get blocked with a clearer log line. 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.