{"name":"tengu_osier_pylon_trace","slug":"tengu-osier-pylon-trace","family":"flag","title":"Feature flags","noun":"feature flag","description":"Claude could read console errors and failed loads from real viewers of an artifact, but it's switched off.","description_source":"entry","described_by":{"version":"2.1.238","anchor":"artifact-tool-gains-a-verify-action-for-viewer-side-runtime-"},"presence":{"first_seen":"2.1.238","removed_in":null,"in_current_build":true,"newest_mined":"2.1.309","builds":61,"mined_builds":150,"first_cited":{"version":"2.1.238","released_at":"2026-08-20 18:01:54","spans":1}},"aliases":[],"entries":[{"version":"2.1.280","anchor":"artifact-verifypreview-tools-merged-into-a-single-check-t","heading":"Artifact verify\/preview tools merged into a single 'check' tool","line":"Artifact verify and preview tools are merged into one 'check' tool with old verb names still accepted","released_at":"2026-09-22 15:44:39","reason":"gate cited by this entry"},{"version":"2.1.257","anchor":"new-check-artifact-addon-tool-local-preview-runtime-dia","heading":"New \"check\" artifact addon tool: local preview + runtime diagnostics, dark-launched behind two flags","line":"A new check artifact addon previews a page locally and reads viewers' runtime diagnostics, behind two env vars.","released_at":"2026-09-01 17:15:33","reason":"found in this entry's text, gate cited by this entry"},{"version":"2.1.238","anchor":"artifact-tool-gains-a-verify-action-for-viewer-side-runtime-","heading":"Artifact tool gains a verify action for viewer-side runtime diagnostics, off by default","line":"Claude could read console errors and failed loads from real viewers of an artifact, but it's switched off.","released_at":"2026-08-20 18:01:54","reason":"gate cited by this entry, found in this entry's text"}],"entries_total":3,"docs":[],"docs_total":0,"gates":[{"version":"2.1.280","state":"unknown","account":null,"baseline":null,"code_default":false},{"version":"2.1.257","state":"unknown","account":null,"baseline":null,"code_default":false},{"version":"2.1.238","state":"unknown","account":null,"baseline":null,"code_default":false}],"related":[{"name":"tengu_1p_event_batch_config","slug":"tengu-1p-event-batch-config","description":"Default `{}`. Batch settings for Claude Code's first-party event logger: `scheduledDelayMillis` (falls back to `OTEL_LOGS_EXPORT_INTERVAL`, then `10000`), `maxExportBatchSize` (default `200`) and `maxQueueSize` (default `8192`), plus `skipAuth`, `maxAttempts`, `path` and `baseUrl` passed to the exporter. When the value changes during a session, the logger is flushed and rebuilt with the new settings."},{"name":"tengu_account_plugins_sync_enabled","slug":"tengu-account-plugins-sync-enabled","description":"Plugins you enabled on claude.ai can be pulled to your machine, but only your account server can enable it."},{"name":"tengu_account_skills_sync_enabled","slug":"tengu-account-skills-sync-enabled","description":"Account skills-sync eligibility logic generalized into a reusable descriptor"},{"name":"tengu_adopt_claim","slug":"tengu-adopt-claim","description":"Stale adopted session claims now return their data marked stale instead of being discarded"},{"name":"tengu_adopt_link","slug":"tengu-adopt-link","description":"Adopting an agent's transcript now hard-links the file, copying only when linking is impossible."},{"name":"tengu_adopt_relink","slug":"tengu-adopt-relink","description":"On startup, subagent transcripts stored as symlinks are converted to hard links or copies."},{"name":"tengu_advisor_unknown_content","slug":"tengu-advisor-unknown-content","description":"Advisor output you couldn't see now shows an error or a clear \"declined to advise\" message."},{"name":"tengu_agent_frontmatter_mode_widening_carry_ignored","slug":"tengu-agent-frontmatter-mode-widening-carry-ignored","description":"An agent definition's permissionMode can no longer widen the mode inherited from its parent context."},{"name":"tengu_agent_hooks_origin_untrusted","slug":"tengu-agent-hooks-origin-untrusted","description":"Agents in untrusted folders can no longer define inline MCP servers; trust the project to allow it."},{"name":"tengu_agent_list_attach","slug":"tengu-agent-list-attach","description":"Default `false`. When `CLAUDE_CODE_AGENT_LIST_IN_MESSAGES` is unset or not a recognised boolean, `true` sends the `Agent` tool's list of agent types as `agent_listing_delta` attachments in the conversation (after the first, only the added and removed types) and leaves it out of the tool description. A truthy `CLAUDE_CODE_DISABLE_ATTACHMENTS` or `CLAUDE_CODE_SIMPLE` keeps the list in the description."}],"url":"https:\/\/changelogs.core-directive.com\/reference\/flag\/tengu-osier-pylon-trace","family_url":"https:\/\/changelogs.core-directive.com\/reference\/flag.json"}