mirror of
https://github.com/headroomlabs-ai/headroom.git
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## Description Removes both third-party CLI context tools — **rtk** and **lean-ctx** — and with them the context-tool selector itself. Headroom no longer downloads, installs or configures either one, and there is no replacement. The previous pass (#2344) gated only three entry points inside `headroom/cli/wrap.py`. That left the feature reachable in practice: | Gap | Effect | |---|---| | `scripts/install.sh:1544`, `install.ps1:1681` | Ran `rtk init --global --auto-patch` from bash/PowerShell, **bypassing the Python gate entirely** — `curl \| sh` still wrote a Claude Code `PreToolUse` hook regardless of `HEADROOM_RTK` | | `wrap.py` `_setup_context_tool_for_agent` | **`wrap openhands` was broken by default**: `rtk_required=True` met a gate returning `None` → `SystemExit(1)`. Invisible because all 8 openhands tests patched `_ensure_rtk_binary` to a fake path | | `proxy/helpers.py`, `subscription/tracker.py` | Proxy shelled out to `rtk gain` from `/stats`, the dashboard and `headroom perf`; the tracker polled it per contribution (`_RTK_WIRING_DEFAULT = "enabled"`) | | No cleanup path | Nothing removed artifacts an earlier default had installed, so a machine that once ran the old default kept rtk in the loop forever (#1669, #1955) | Also worth noting: the rtk binary download had **no SHA or signature verification** — only `rtk --version` as a smoke test. ## Type of Change - [x] Bug fix (non-breaking change that fixes an issue) - [ ] New feature (non-breaking change that adds functionality) - [x] Breaking change (fix or feature that would cause existing functionality to change) - [ ] Documentation update - [ ] Performance improvement - [x] Code refactoring (no functional changes) ## Changes Made **Removed** — `headroom/rtk/` and `headroom/lean_ctx/` packages, `headroom/cli/wrap_rtk_metrics.py`, `_selected_context_tool` / `_setup_context_tool_for_agent` / `_VALID_CONTEXT_TOOLS`, the `--rtk` / `--no-rtk` / `--no-project-rtk` / `--keep-rtk` flags across all 18 wrap subcommands, `HEADROOM_RTK*`, the proxy-side `rtk gain` polling, the dashboard CLI-filtering panel (rows + all 8 `cliFiltering*` Alpine getters), `paths.rtk_path()` / `lean_ctx_path()`, the SDK path helpers, `benchmarks/rtk_loop_learn_eval.py`, and the `headroom/rtk/**` CI path filters. **Fails loudly, not silently** — `--context-tool` / `--no-context-tool` / `HEADROOM_CONTEXT_TOOL` are kept solely to error out. They live in shell profiles, aliases and CI jobs, and accepting them as a no-op would read as Headroom having quietly stopped working. The installers reject them too, which matters more than it looks: their arg parsers forward the first unknown flag **and everything after it** to the wrapped tool, so a leftover `--no-rtk` would have silently swallowed a following `--port` and then been ignored downstream. **New `headroom/context_tool_cleanup.py`** — deleting the code cannot help a machine that already ran the old default, since the hooks, binaries and injected guidance are durable on disk. `purge_context_tool_artifacts()` runs once per `wrap`/`unwrap` and removes the registered hook entries, the generated hook scripts, the Headroom-managed `~/.local/bin` symlinks, the vendored `~/.headroom/bin/{rtk,lean-ctx}` binaries, the `lean-ctx` MCP server entry and the marker-fenced instruction blocks. Deliberately conservative: idempotent, **skips** a malformed config rather than overwriting it, and only unlinks a symlink resolving inside Headroom's own bin dir so a user's own build is untouched. It reports on **stderr**, because `wrap/unwrap openclaw --prepare-only` emit machine-readable JSON on stdout as their entire contract. Skipped for `wrap selfheal` (runs from a SessionStart hook; must not race Claude Code's writer for `~/.claude.json`) and for `--help`, which must stay read-only. **Client-config hardening** (discovered while investigating a "corrupted Serena settings file" report) — `wrap.py` reset a settings file to `{}` when an existing file would not parse, then wrote that back. One hand-edited typo or a transient `EACCES`/`EINTR` on a valid file destroyed the user's `permissions`, `env` and `hooks`, on **every `headroom wrap claude`**. It now refuses to write. Separately, `fsutil.write_text` is now atomic (temp file + `fsync` + `os.replace`), fixing all 14 non-atomic client-config writes at once; it follows symlinks rather than replacing them (dotfile managers) and preserves an existing file's mode. **Deliberately kept** — `rtk` stays in the wrapper-peel list in `transforms/content_router.py`. It sits beside `sudo`/`env`/`timeout` as shell-command grammar, so `rtk cat f` is still classified as a file read for anyone running their own rtk install, which the purge intentionally leaves alone. ## Testing - [x] Unit tests pass (`pytest`) - [x] Linting passes (`ruff check .`) - [x] Type checking passes (`mypy headroom`) - [x] New tests added for new functionality - [x] Manual testing performed ### Test Output ```text $ ruff check headroom/ tests/ e2e/ --exclude headroom/dashboard/templates All checks passed! $ ruff format --check headroom/ tests/ e2e/ --exclude headroom/dashboard/templates 1255 files already formatted $ mypy headroom/ Success: no issues found in 508 source files $ pytest tests/test_context_tool_cleanup.py -q 11 passed $ pytest tests/test_fsutil.py -q 12 passed $ pytest tests/test_cli/test_wrap_codex.py -q # 89 tests 89 passed in 431.68s $ pytest tests/test_cli/test_wrap_opencode.py -q 39 passed in 257.46s $ pytest tests/test_cli/test_wrap_helpers.py -q 45 passed $ pytest tests/test_paths.py -q 75 passed $ pytest tests/test_cli/test_unwrap_claude.py -q 14 passed $ pytest tests/test_proxy_savings_history.py -q 39 passed $ pytest tests/test_cli/test_wrap_copilot.py -q 27 passed $ pytest tests/test_cli/test_wrap_zcode.py -q 20 passed $ pytest tests/test_subscription_tracker.py -q 9 passed $ pytest tests/test_proxy_dashboard_stats_cache.py -q 5 passed, 1 skipped ``` Repo-wide grep for 14 removed symbols (`headroom.rtk`, `headroom.lean_ctx`, `_ensure_rtk_binary`, `_selected_context_tool`, `_get_context_tool_stats`, `rtk_path`, `lean_ctx_path`, `wrap_rtk_metrics`, `HEADROOM_RTK`, `cli_tokens_avoided`, `tokens_saved_rtk`, …) across `*.py`, `*.ts`, `*.sh`, `*.ps1`, `*.yml`, `*.html`: **zero hits**. Notable test changes: `test_wrap_openhands.py` no longer patches `_ensure_rtk_binary` and asserts `wrap openhands --prepare-only` exits 0 unpatched — the regression that was previously masked. `test_wrap_continue.py` and `test_wrap_hintfile_agents.py` were removed (every test drove RTK instruction injection). A new `test_subscription_tracker.py::test_load_state_written_before_cli_context_tools_were_removed` proves a pre-removal `subscription_state.json` still loads. ## Real Behavior Proof - **Environment:** macOS 15.4 (darwin 25.4.0), Python 3.12.6, Headroom @ this branch, real `~/.headroom` and `~/.claude` on the dev machine. - **Exact command / steps and observed result:** ```text # 1. Retired flag fails loudly instead of silently no-op'ing $ headroom wrap codex --prepare-only --context-tool rtk Error: CLI context tools (rtk, lean-ctx) have been removed from Headroom: they rewrote shell commands through a third-party binary Headroom no longer manages. Drop --context-tool / --no-context-tool and unset HEADROOM_CONTEXT_TOOL; `headroom wrap` uninstalls what they left behind on first run. $ HEADROOM_CONTEXT_TOOL=lean-ctx headroom wrap codex --prepare-only Error: CLI context tools (rtk, lean-ctx) have been removed from Headroom: ... # 2. install.sh rejects the retired flags (extracted parse_wrap_args harness) ['--no-rtk', '--port', '9999'] rc=1 ERROR: CLI context tools ... Drop --no-rtk ['--context-tool=rtk'] rc=1 ERROR: CLI context tools ... Drop --context-tool $ bash -n scripts/install.sh # syntax OK # 3. Purge ran against the real machine, which had all the orphaned artifacts $ python -c "from headroom.context_tool_cleanup import purge_context_tool_artifacts; ..." removed ~/.headroom/bin/lean-ctx (51 MB) removed ~/.headroom/bin/rtk (7.7 MB) removed ~/.local/bin/rtk (symlink into ~/.headroom/bin) removed ~/.claude/hooks/rtk-rewrite.sh removed 8 lean-ctx-* hook scripts # ~/.claude.json afterwards: 90 top-level keys, 19 projects, mcpServers unchanged # → ~59 MB reclaimed, no unrelated key touched # 4. stdout stays machine-readable while the purge reports (planted a fake artifact) $ headroom wrap openclaw --prepare-only --gateway-provider-id codex >out 2>err $ cat out {"enabled":true,"config":{"proxyPort":8787,...}} # parses as JSON $ cat err Retired CLI context tool cleanup: removed /Users/tcms/.headroom/bin/rtk # 5. --help is inert (planted artifact survives), a real run purges $ headroom wrap codex --help → artifact survived: CORRECT $ headroom wrap openclaw --prepare-only → purged: CORRECT # 6. MCP purge dry-run against a copy of the real 82 KB ~/.claude.json top-level keys 90 -> 90; projects 19 -> 19; LOST keys: none all content outside mcpServers byte-identical: True ``` Dashboard rendered via the Playwright test after the panel removal: "Token Savings" shows only `Proxy 0 (0.0%)` / `Of total wire: 36.86%`, and "Token Usage" reads Before Compression → Proxy Removed → After Compression with no "Filtered (this session)" row. Nothing below the removed panel broke. - **Not tested:** Windows and Linux (macOS only) — `install.ps1` is verified by brace-balance and inspection, not executed, since no `pwsh` is available locally. The wrap e2e suite (`e2e/wrap/run.py`) was updated but not run; it needs the Docker e2e image. `serena project index` interaction is exercised in the stacked base PR. ## Review Readiness - [x] I have performed a self-review - [x] This PR is ready for human review ## Checklist - [x] My code follows the project's style guidelines - [x] I have performed a self-review of my code - [x] I have commented my code, particularly in hard-to-understand areas - [x] I have made corresponding changes to the documentation - [x] My changes generate no new warnings - [x] I have added tests that prove my fix is effective or that my feature works - [x] New and existing unit tests pass locally with my changes - [x] I did **not** edit `CHANGELOG.md` — it is generated by release-please from my Conventional Commit PR title (a CI guard enforces this) ## Additional Notes **Stacked on #2676** (`tejas/serena-config-bootstrap`) — please merge that first; this PR's base should then be retargeted to `main`, or it will read as containing that fix too. **Breaking-change migration for users:** - Drop `--rtk`, `--no-rtk`, `--no-project-rtk`, `--keep-rtk`, `--context-tool`, `--no-context-tool` from any alias, script or CI job, and unset `HEADROOM_RTK*` / `HEADROOM_CONTEXT_TOOL`. They now error rather than being ignored, so the failure is immediate and self-explaining. - Previously-installed artifacts are purged automatically on the next `wrap`/`unwrap`; no manual cleanup needed. - `headroom perf --json` no longer carries a `cli_filtering` key, and `/stats` no longer returns a `context_tool` section. **Docs:** `docs/rtk-architecture.md` deleted; RTK/lean-ctx removed from `README.md`, `docs/content/docs/{configuration,opencode,grok-build,docker-install,filesystem-contract}.mdx`, `docs/observability.md` and the matching `wiki/` pages. `REALIGNMENT/09-phase-G-rtk-observability.md` is marked SUPERSEDED rather than deleted, to keep the planning record. **Follow-ups not in scope:** `_emit_wrap_interrupted` was deleted as dead code — its only caller was the `except KeyboardInterrupt` guarding the binary download, so with no download there is nothing slow left to interrupt.
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200 lines
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# 12 — Decisions Needed
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Open questions the realignment can't resolve unilaterally. Greenlight or alternative each before the corresponding PR lands.
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---
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## Q1. Phase A timing — land tonight or wait?
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**Recommendation:** Land **PR-A1 tonight**. It's a small diff (-180/+30) that eliminates the worst cache-killer cluster (P0-3, P0-4, P0-5 stop firing immediately). The proxy goes to passthrough on `/v1/messages`; compression returns in Phase B. Net positive because today's compression is actively destroying cache hit rate.
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PR-A2 through PR-A8 land over the rest of the week.
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**Alternative:** Hold all of Phase A until the synthesis is "perfect." Risk: cache hit rate stays poor.
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---
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## Q2. ICM removal scope — Tier 1+2, or include Tier 3?
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**Recommendation: Tier 1 + Tier 2 in Phase B PR-B1** (~10K LOC).
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- **Tier 1** (ICM proper): `intelligent_context.py`, `manager.rs`, `icm.rs`, the proxy call site.
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- **Tier 2** (subsystems whose only consumer is ICM): `RollingWindow`, `ProgressiveSummarizer`, `scoring.py`, `tool_crusher.py`, `MessageScorer`, all of `crates/headroom-core/src/scoring/` and `relevance/`, most of `context/` (keep `safety.rs`).
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- **Tier 3** (separable cleanup): `CacheAligner` rewrite path is in Phase A PR-A2 (already scheduled). Memory `_inject_system_context` paths in Phase A PR-A2 + Phase B PR-B6 (already scheduled).
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So "Tier 1 + Tier 2" is the right scope for the Phase B big-delete PR; Tier 3 is already covered by Phase A and Phase B's other PRs.
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**Alternative:** Stop at Tier 1 (just ICM proper). Risk: ~6 K LOC of dead-but-still-imported scoring/relevance machinery; future contributors won't know it's dead.
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---
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## Q3. MessageScorer Rust port — delete?
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**Recommendation: Delete.**
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The PR #338 / #343 port (April 2026) was investment in the wrong abstraction (per Agent G's audit: scoring's only consumer is `DropByScoreStrategy::try_fit`, which Phase B retires). Keeping it as a dead crate creates maintenance debt and confusion. Sunk cost stays sunk; the parity-harness scaffolding learnings carry forward to live-zone work where they actually matter.
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Folded into Phase B PR-B1.
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**Alternative:** Keep the crate around as off-path "in case scoring is needed later." Risk: dead-code review burden every PR.
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---
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## Q4. Stage 3g (lossless-first compression pipeline, issue #315) — re-scope or close?
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**Context:** Per project memory `~/.claude/projects/-Users-tchopra-claude-projects-headroom/memory/project_lossless_first_pipeline.md`, Stage 3g was queued to formalize "lossless-then-lossy-then-CCR ordering as a `CompressionPipeline` orchestrator + `LosslessTransform`/`LossyTransform` traits." The plan assumed an ICM-style orchestrator over the messages array.
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**Recommendation:** **Re-scope** issue #315 to "live-zone-only pipeline orchestrator." The traits stay (`LosslessTransform`/`LossyTransform`); the scope changes from "history compactor" to "live-zone block dispatcher." This is what Phase B PR-B2 builds. Update issue #315's body to reflect the realignment.
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**Alternative:** Close issue #315 and treat Phase B PR-B2 as fulfilling its intent. Risk: history of the decision is lost.
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---
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## Q5. Headroom Loop / AWS Marketplace BYOC — affected scope?
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**Context:** Per project memory `project_headroom_loop.md` (enterprise paid product) and `project_headroom_aws_marketplace.md` (BYOC CFN stack in customer VPC). Both depend on the OSS proxy.
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**Recommendation:** The realignment **strengthens** both:
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- Headroom Loop's value proposition is "trace stream + enterprise compression policy"; Phase F's auth-mode policy is exactly the surface Loop wants to gate on.
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- AWS Marketplace BYOC's pitch is "context compression in front of Bedrock"; Phase D's native Bedrock support makes that pitch real (today's LiteLLM-converted Bedrock path was fake; Phase D fixes it).
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No re-scoping needed; revisit after Phase D lands.
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**Alternative:** Pause Headroom Loop / Marketplace work until Phase D completes. Recommended if their roadmap conflicts with Phase D timing.
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---
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## Q6. `make test-parity` per-PR gate — enable now or wait?
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**Recommendation:** Enable now (Phase I PR-I6) with the existing stubs. `Skipped` is permitted; `Diff` fails the build. As Phase I PR-I5 promotes stubs to real comparators, the per-PR gate gradually tightens.
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**Alternative:** Wait until all stubs are real. Risk: parity divergence merges silently for the next month.
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---
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## Q7. Operator config switch — explicit `HEADROOM_PROXY_BACKEND` env var, or implicit?
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**Context:** During Phase H rollout, operators need a way to choose Python vs Rust proxy.
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**Recommendation:** Add `HEADROOM_PROXY_BACKEND={python|rust}` env var in Phase H PR-H1; default to `rust` once the canary in Phase I PR-I4 confirms ≥99.9% byte-equality. Keep the Python proxy alive in the codebase for 30 days post-Phase-H as an explicit rollback target. After 30 days of stable Rust operation, run Phase H PR-H2/H3 to delete Python.
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**Alternative:** Cut over implicitly (`headroom proxy start` always uses Rust after Phase H). Riskier; no clean rollback path.
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---
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## Q8. Container image strategy — single binary or multi-stage?
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**Recommendation:** Single binary (`headroom-proxy` Rust). Container is `FROM scratch` or `FROM gcr.io/distroless/static`. Image size drops from ~500 MB (with Python + LiteLLM + ONNX models) to ~50 MB.
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**Alternative:** Multi-stage Docker with Rust binary + Python sidecar (for evals/learn/memory writers). Recommended only if those subsystems become production-relevant; today they're CLI tools.
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---
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## Q9. RTK proxy-side invocation — ever revisit?
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**Resolved — moot.** RTK was removed from Headroom outright (see
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`09-phase-G-rtk-observability.md`), so there is no proxy-side invocation to
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revisit. The original recommendation was "no, document the decision in
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`docs/rtk-architecture.md`" (that doc was deleted with the feature). The argument
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is kept because reasons 1–3 apply to any future shell-output rewriter:
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1. Cache hot zone risk: shell-out + buffer per tool result is correctness-fragile.
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2. Parallel implementation: `crates/headroom-core/src/transforms/log_compressor.rs` covers post-hoc log/output compression; RTK rewrites *commands* (different value).
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3. RTK itself is a third-party binary the team doesn't control; an upstream version change silently busts cache.
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If a future requirement emerges (e.g., "Headroom must compress shell output for users who don't run wrap"), reconsider with explicit cache-safety design.
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**Alternative:** Build proxy-side RTK as a feature-flagged opt-in. Recommended only if the wrap-CLI breadth (PR-G1) doesn't cover enough surface.
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---
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## Q10. Bedrock/Vertex priority — parallel with proxy port (Phase D in calendar) or after Phase H?
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**Recommendation:** **Parallel.** Phase D blocks H2 (Python LiteLLM retirement) but not H1 (Python proxy retirement). Run Phase D and Phase C/E/F/G concurrently.
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**Alternative:** Sequential, Phase D after Phase H. Risk: Bedrock/Vertex users stay on the broken Python LiteLLM path for an extra month.
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---
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## Q11. Memory subsystem — auto-tail mode default, or tool-only?
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**Recommendation:** Auto-tail mode default in Phase B PR-B6, with tool-only mode behind a flag. Migrate users to tool-only over the next 6 months once docs and tooling are mature. Auto-tail is byte-deterministic (per the cache-safety invariant) and matches existing UX.
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**Alternative:** Force tool-only immediately. Risk: breaks customers' existing memory-augmented prompts.
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---
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## Q12. Parity harness post-Phase-H — keep or delete?
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**Context:** After Phase H deletes Python, `crates/headroom-parity/` no longer has a Python side to compare against. Per Phase H PR-H3, this is a decision point.
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**Recommendation:** **Repurpose**, don't delete. Rename to `crates/headroom-version-parity/` and use it to compare current-Rust-version vs previous-Rust-version on the recorded fixtures. Catches Rust-vs-Rust regressions during future ML compressor variants (e.g., when Kompress is ported to Rust via `ort`).
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**Alternative:** Delete entirely. Save ~2K LOC. Risk: no automated regression test for compressor changes.
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---
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## Q13. Auth-mode UA detection list — which CLIs to recognize?
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**Phase F PR-F1 starts with this list:**
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- `claude-cli/` (Anthropic CLI)
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- `claude-code/` (Claude Code)
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- `codex-cli/` (Codex CLI)
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- `cursor/` (Cursor IDE)
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- `claude-vscode/`
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- `github-copilot/`
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- `anthropic-cli/`
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- `antigravity/` (Cloudcode Antigravity)
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**Recommendation:** Extend over time as new CLIs emerge. Alphabetic sort for determinism. Document in `docs/auth-modes.md`.
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**Alternative:** Start with a smaller list; expand reactively. Risk: subscription users mis-classified as PAYG and fingerprint-leaked.
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---
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## Q14. The ICM removal blast radius — confirm acceptable
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**Counts:**
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- Lines deleted (Python): ~3,300
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- Lines deleted (Rust): ~4,500
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- Files deleted: ~30
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- Tests deleted: ~50
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- PRs that recently merged but become wasted work: PR #338, PR #343 (MessageScorer Rust port)
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- Project memory updates needed: 1 (the "53270 lines" content_router.py figure was wrong by 25× — already corrected in `MEMORY.md`).
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**Recommendation:** Acceptable. The cache-killer bugs cost more than the deleted code's hypothetical future value.
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---
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## Q15. Calendar + capacity — sequential or parallel?
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**Sequential calendar:** ~13 weeks. One contributor working through phases A→I.
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**Parallel calendar:** ~8 weeks with 2-3 contributors splitting along these natural boundaries:
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- Lead: Phase A (lockdown), Phase B (live-zone), Phase H (retirement) — the critical path.
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- Contributor 2: Phase C (Rust proxy paths), Phase D (Bedrock/Vertex). Self-contained.
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- Contributor 3 (optional): Phase E (cache stabilization), Phase F (auth-mode), Phase G (RTK + obs), Phase I (test infra). Mostly independent.
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**Recommendation:** Parallel. The bug list is real and the cache hit rate is hemorrhaging in production today.
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---
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## Quick answer template
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For decision sign-off, fill in this block:
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```
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Q1 (Phase A timing): [ ] tonight [ ] wait
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Q2 (ICM scope): [ ] Tier 1+2 [ ] Tier 1 only [ ] all 3 tiers
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Q3 (MessageScorer): [ ] delete [ ] keep
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Q4 (issue #315): [ ] re-scope [ ] close
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Q5 (Loop/Marketplace):[ ] proceed unchanged [ ] pause until D
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Q6 (parity gate): [ ] enable now [ ] wait
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Q7 (operator switch): [ ] env var w/ default rust [ ] implicit cutover
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Q8 (container): [ ] single binary [ ] multi-stage
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Q9 (RTK proxy-side): [ ] document never [ ] feature-flag for future
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Q10 (Bedrock priority):[ ] parallel [ ] sequential after H
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Q11 (memory mode): [ ] auto-tail default [ ] tool-only force
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Q12 (parity harness): [ ] repurpose [ ] delete
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Q13 (UA list): [ ] approve list [ ] revise: ___________
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Q14 (ICM blast radius): [ ] accept [ ] reduce scope
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Q15 (calendar): [ ] parallel (2-3 contributors) [ ] sequential
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```
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