e209f56216
BDR-004 documents the decision to adopt auto permission mode as default with classifier safety net, alternatives, and feature-gate caveats. LRN-003 captures the gotcha that Claude Code's disable* settings use the literal sentinel string "disable" rather than a boolean — required context for any future permission-mode change. Journal entry added for 2026-04-27. Co-Authored-By: Claude <noreply@anthropic.com>
56 lines
4.6 KiB
Markdown
56 lines
4.6 KiB
Markdown
---
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type: learnings_registry
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entry_prefix: LRN
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schema:
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id: LRN-XXX
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date: YYYY-MM-DD
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pattern: string (what was observed, abstracted)
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context: string (where/when it happened - concrete)
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future_application: string (when to recall this)
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rules:
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- Capture learnings that apply beyond the current task.
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- Abstract from the incident - the pattern is what is reusable, not the one-shot fact.
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- Link to source (commit, file, PR) when possible.
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- Replaces the previous LESSONS.md format. Old file was empty - no content to migrate.
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---
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# Learnings registry (LRN)
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## Index
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| ID | Date | Pattern | Applies to |
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|----|------|---------|------------|
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| LRN-001 | 2026-04-22 | `rtk` shape-compression breaks pipes | any pipeline chaining `rtk curl/cat/read` into `jq`, `python -c`, `awk` |
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| LRN-002 | 2026-04-23 | Moving report-file paths requires grepping bash READS, not just WRITES | any refactor that moves a generated file used by a dispatcher |
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| LRN-003 | 2026-04-27 | Claude Code `disable*` settings use sentinel string `"disable"`, not boolean | any change to `permissions.defaultMode` or related blocker keys |
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---
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## LRN-001 — `rtk` shape-compression silently breaks downstream parsers
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- **Date**: 2026-04-22
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- **Pattern**: when a tracking tool (`rtk`) intercepts stdout and returns a schematized/compressed representation instead of the raw payload, every downstream parser breaks silently — because the user (or the LLM) never sees `rtk`'s output, only the parser error.
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- **Context**: `rtk curl` replaces raw JSON output with a tokenized version, regardless of TTY vs pipe. Claude Code hooks auto-rewrite `curl` → `rtk curl`, so the behavior is impossible to anticipate without knowing the hook.
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- **Future application**: for any tool that auto-rewrites standard commands, explicitly verify pipe behavior. Documented workaround: `exclude_commands=["curl"]` in `~/.config/rtk/config.toml`, or `rtk proxy`. See `BLK-001`.
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## LRN-002 — Moving report-file paths requires grepping bash READS, not just WRITES
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- **Date**: 2026-04-23
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- **Pattern**: when moving the write path of a generated file (report, artifact, cache), you must also grep the places that READ that file — not only those that write it. Dispatchers (orchestrator skills that dispatch to an agent and then parse the result) typically contain bash commands like `test -s X.md`, `grep ... X.md`, `wc -l X.md` — these refs are invisible if you only grep for "write" or "output path".
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- **Context**: `.claude/audits/` refactor (commit `5c5e82c`). First pass: I updated write paths across 5 skills (seo/geo/harden/validate/code-clean) and 3 agents. The user asked for a verify-gate. They re-grepped and found 10+ bare bash refs (e.g. `test -s HARDEN.md`, `grep -oE ... VALIDATE.md`) I had missed — the dispatchers were broken (looking at project root while the agent was writing to `.claude/audits/`). Fixed in commit `5c5e82c` (bundled with the same commit).
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- **Future application**:
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- Before declaring a file-path migration "complete", grep the **basename** (`grep -rn "HARDEN\.md"`) in addition to the full path — to catch bare bash usages.
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- If the file is used in pipelines (`test`, `grep`, `wc`, `cat`, `head`), search for those verbs explicitly.
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- **Verify-gates save work**: one extra round asked by the user forced exhaustive re-grepping. Without it, two dispatchers would have shipped broken.
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## LRN-003 — Claude Code `disable*` settings use the sentinel string `"disable"`, not a boolean
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- **Date**: 2026-04-27
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- **Pattern**: Claude Code blocker-style settings (`disableAutoMode`, `disableBypassPermissionsMode`) use the literal string `"disable"` as a sentinel. The key being absent means the feature is available; the value `"disable"` is what turns the blocker on. Any other value (including `false`, `true`, `null`) has no effect — the doc explicitly states this.
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- **Context**: switching `permissions.defaultMode` to `"auto"` while `disableAutoMode: "disable"` was still present would have failed at startup ("auto mode unavailable"). The naming `disable<Foo>: "disable"` reads ambiguously — easy to assume it's a boolean toggle and leave the key in place.
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- **Future application**:
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- Before changing `defaultMode`, audit the matching `disable*` key in the same `permissions` block. If present with value `"disable"`, remove it.
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- Same logic for `bypassPermissions` mode and `disableBypassPermissionsMode`.
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- Don't trust the doc's naming — read the value semantics. Sentinel strings beat booleans here because the harness can distinguish "unset" from "explicitly off" (admin policy).
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- **Reference**: commit `1421578`, doc `https://code.claude.com/docs/en/settings`.
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