chore(concepts): append 2026-05-09 7:58 PM same-day re-run entry

Records second v2.1.138 audit run within the day. README CONCEPTS table
unchanged between runs (no commits touched lines 22–68). Findings entirely
INVALID or ON HOLD: 1 spurious drift claim verified false (Tasks `/tasks`
command is real per claude-commands.md:75); 6 RECURRING-INVALID findings
re-flagged per durable user policy (platform surfaces, SDK-scoped pages,
sibling beta inconsistency); 1 ON HOLD (Voice Dictation page no longer
reads as beta but tag persists conservatively); 4 verifications COMPLETE.
No CONCEPTS table edits applied.

Co-Authored-By: Claude <noreply@anthropic.com>

changelog/best-practice/concepts/changelog.md

@@ -536,3 +536,24 @@ Tracks drift between the README CONCEPTS table and official Claude Code document
 | 18 | LOW | Verification | Bundled Skills anchor `#bundled-skills` — stable since v2.1.113 | ✅ COMPLETE (stable) |
 | 19 | LOW | Verification | Ultrareview anchor `#track-a-running-review` — stable since v2.1.118 | ✅ COMPLETE (stable) |
 | 20 | LOW | Verification | claude-code-guide cross-check — independent research surfaced 21 features (matched dedicated agent), corroborated v2.1.127–v2.1.138 changes (`worktree.baseRef`, `parentSettingsBehavior`, `/effort`, `${CLAUDE_EFFORT}`, sandbox.bwrapPath, `--plugin-url`, `.zip` archives, `hard_deny`); also re-surfaced long-standing platform-surface concepts (Output Styles, Sandboxing, Headless, IDE Integration, Cloud Providers) which are RECURRING INVALID per user policy; no contradictions | ✅ COMPLETE (both agents aligned) |
+
+---
+
+## [2026-05-09 07:58 PM PKT] Claude Code v2.1.138
+
+> **Note:** Same-day re-run of the 7:02 PM v2.1.138 audit. README CONCEPTS table did not change between runs (no commits touched lines 22–68). Findings are largely identical; this entry records the badge refresh, the new direct-URL spot-checks, and one new INVALID claim worth verifying.
+
+| # | Priority | Type | Action | Status |
+|---|----------|------|--------|--------|
+| 1 | HIGH | Spurious Drift Claim | `workflow-concepts-agent` flagged Tasks row's `/tasks` slash command as possibly nonexistent (0.70 confidence) — suggested replacing with `TaskCreate`/`TaskList`/etc. tool names. Verified against `best-practice/claude-commands.md` line 75 — `/tasks` IS a real command (Debug tag, alias `/bashes`, "List and manage background tasks"). Row description is correct as written | ❌ INVALID (verified `/tasks` exists in current commands report) |
+| 2 | MED | New Missing Concept | `claude-code-guide` agent surfaced **Tool Search** (`/en/agent-sdk/tool-search`) as missing — "Scale to many tools with tool search" page in Agent SDK section | ❌ INVALID (SDK-scoped concept, not main CONCEPTS-table material; consistent with prior INVALID rulings on platform-surface and SDK-only pages) |
+| 3 | MED | New Behavioral Drift | `workflow-concepts-agent` flagged subagent skill discovery via Skill tool (v2.1.133 changelog) as a behavioral interaction not surfaced by either Subagents or Skills row descriptions | ❌ INVALID (cross-cutting interaction; current row descriptions correctly point to canonical official pages where this is documented; CONCEPTS rows aren't the right surface for behavioral interactions between concepts) |
+| 4 | HIGH | Stale URL (recurring) | Commands URL `/en/slash-commands` now confirmed via direct fetch to actually resolve to `/en/skills` page (title: "Extend Claude with skills"); canonical commands page is `/en/commands` per inline note inside the resolved page | ❌ INVALID (RECURRING from 2026-03-10 across 23+ runs; URL still resolves via redirect; user policy is to keep as-is) |
+| 5 | MED | Missing Concept (recurring) | Both agents re-flagged Desktop App, IDE Integrations (VS Code/JetBrains), Deep Links, Output Styles, Sandboxing, Permissions, Keybindings, Model Configuration, Auto Memory, Headless Mode, Tools Reference as missing standalone rows | ❌ INVALID (RECURRING from 2026-03-10/2026-03-17/2026-04-08/2026-04-09/2026-05-01/2026-05-09 7:02 PM; user policy: platform surfaces and Settings sub-links are not standalone concepts) |
+| 6 | MED | Beta Badge Currency | `workflow-concepts-agent` raised beta-tag-consistency concern — Routines has beta tag but Scheduled Tasks does not, despite shared scheduling infrastructure; Tasks lacks beta despite Agent Teams' explicit experimental status | ❌ INVALID (different upstream pages have different beta-status copy; rule #7 verifies tag matches docs page, not internal consistency between sibling rows; tags are accurate per their own pages) |
+| 7 | LOW | Verification (Rule #1) | Spot-fetched 6 external URLs this run (`/en/slash-commands`, `/en/voice-dictation`, `/en/desktop`, `/en/vs-code`, `/en/jetbrains`, `/en/deep-links`) — all returned 200; full 35+ URL validation done in prior 7:02 PM run, no new breakage detected | ✅ COMPLETE (no new broken URLs) |
+| 8 | LOW | Verification (Rule #4) | Local badge paths re-confirmed via prior-run validation (`best-practice/`, `implementation/`, `reports/`, `.claude/settings.json`, `.mcp.json`, `CLAUDE.md` all exist) — README CONCEPTS table unchanged since 7:02 PM | ✅ COMPLETE (paths intact) |
+| 9 | LOW | Verification (Rule #2) | All previously-validated anchor fragments (`#organize-rules-with-clauderules`, `#run-parallel-claude-code-sessions-with-git-worktrees`, `#eliminate-prompts-with-auto-mode`, `#bundled-skills`, `#track-a-running-review`) still resolve per prior run; no anchor renames in the last hour | ✅ COMPLETE (anchors stable) |
+| 10 | LOW | Verification (Rule #6) | TIPS section URL consistency — no CONCEPTS URL was changed this run; no TIPS-section sweep needed | ✅ COMPLETE (no propagation work required) |
+| 11 | LOW | Verification (Rule #7) | Beta-badge currency — directly fetched `/en/voice-dictation` this run; page does not read as beta/research-preview but README badge persists per user pattern of keeping beta tags conservative for non-GA features | ✋ ON HOLD (kept — may revisit when official voice-dictation page adds GA marker) |
+| 12 | LOW | Spurious Drift Claim | `workflow-concepts-agent` suggested 7 of the 13 main-table rows have empty Description columns that could be filled (Checkpointing, Devcontainers, Ultraplan, Fast Mode, Slack, etc.) | ❌ INVALID (intentional minimalism — empty Description column means no badges/sub-links beyond the title link; not drift) |