Item 46 Bucket A slice 1: skip redundant fallback-chain retry on conda-create exhaustion

[mixmansoundude]

Summary

• First slice of CLAUDE.md Active Backlog Item 46's "Bucket A" (the remaining genuinely-doomed :die call sites, tracked separately from Item 45 and Bucket B which are already merged). :conda_create_failed's call :die previously fell through into :conda_create_done, which unconditionally set HP_PY to a path that provably does not exist, re-detected that via its own if not exist guard, and called :handle_conda_failure a second time -- replaying the just-failed embed download and venv creation attempts, and asking the REQ-014 system-Python consent prompt twice, for a genuine (non-cascade) total-tier-exhaustion failure.
• Fix: add goto :after_env_mode_selection right after that call :die line, mirroring the already-shipped :hp_test_conda_fail test-bypass sibling a few thousand lines below, which has carried the identical goto since before this change.
• Honest scope note, caught during implementation via careful control-flow re-tracing (not by review): this does not reduce total pause count to one. :after_env_mode_selection has its own if not defined HP_PY guard that now fires instead (previously masked, because :conda_create_done used to leave HP_PY defined-but-broken, which that specific check doesn't catch). The genuine win is skipping the second :handle_conda_failure call and its embed/venv-attempt + system-consent-prompt replay -- not cutting pause count to one. All updated docs (CLAUDE.md, a new docs/agent-interconnect.md section, the regression test header, and docs/agent-ndjson.md) describe this accurately rather than overclaiming.
• Regression test (tests/selfapps_entrysmoke_no_interpreter.ps1, conda-full lane) updated: asserts [ERROR] python.exe missing from conda environment. is now absent (proving the second :handle_conda_failure call is skipped) and the new [ERROR] Active Python interpreter not resolved. line is present (proving the fall-through lands at :after_env_mode_selection's own guard rather than being silently swallowed).

Test plan

• python tools/check_delimiters.py run_setup.bat -- clean
• tools/run_sanity_sweep.sh (compileall, pyflakes, delimiter check, CRLF check, markdownlint, yamllint, actionlint, ASCII sweep, PowerShell AST parse sweep, full pytest suite) -- all green, 528 passed / 3 skipped
• python tools/check_ndjson_registry.py -- PASS, no doc/code registry mismatches
• Confirmed via grep that only tests/selfapps_entrysmoke_no_interpreter.ps1 references the two message strings this change affects; tests/selfapps_cascade_conda_create_fail.ps1 is structurally unaffected (its scenarios always branch away via the pre-existing cascade-re-entry check before reaching the modified line)
• Full CI matrix (gated real/conda-full lanes especially) -- pending this PR's own run

Co-Authored-By: Claude Sonnet 5 noreply@anthropic.com
Claude-Session: https://claude.ai/code/session_017SQ1rvJxDbE71pTXJ4QvLV

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📒 Files selected for processing (5)

• CLAUDE.md
• docs/agent-interconnect.md
• docs/agent-ndjson.md
• run_setup.bat
• tests/selfapps_entrysmoke_no_interpreter.ps1

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📓 Path-based instructions (13)

**/*.{md,bat,cmd,ps1,py,sh,yml,yaml,json}

📄 CodeRabbit inference engine (AGENTS.md)

Keep text ASCII-only and do not manually change line endings; follow .gitattributes.

Files:

• docs/agent-ndjson.md
• tests/selfapps_entrysmoke_no_interpreter.ps1
• run_setup.bat
• docs/agent-interconnect.md
• CLAUDE.md

**/*.md

📄 CodeRabbit inference engine (AGENTS.md)

Cite run_setup.bat locations by stable label or subroutine name rather than exact line number in documentation.

Files:

• docs/agent-ndjson.md
• docs/agent-interconnect.md
• CLAUDE.md

**/*.ps1

📄 CodeRabbit inference engine (AGENTS.md)

**/*.ps1: Prepend the TLS 1.2 SecurityProtocol assignment and retain -UseBasicParsing on every PowerShell 5.1 Invoke-WebRequest call.
Before system-wide installation, silently check elevation with fsutil dirty query %systemdrive% >nul 2>&1; on failure, use the per-user fallback.

Files:

• tests/selfapps_entrysmoke_no_interpreter.ps1

**/*.{ps1,psm1,psd1}

📄 CodeRabbit inference engine (AGENTS.md)

Validate modified PowerShell files with the .NET AST parser or tools/ps-compileall.ps1; do not skip validation on Linux, and directly invoke modified scripts after installing pwsh where practical.

Files:

• tests/selfapps_entrysmoke_no_interpreter.ps1

**/*.{bat,cmd,ps1,py,yml,yaml,json}

📄 CodeRabbit inference engine (AGENTS.md)

Run tools/check_delimiters.py to validate paired delimiters and quotes while respecting language-specific comments and escaping.

Files:

• tests/selfapps_entrysmoke_no_interpreter.ps1
• run_setup.bat

**/*.{yml,yaml,bat,ps1,py}

📄 CodeRabbit inference engine (AGENTS.md)

Enforce conda-forge only: add conda-forge and remove defaults before updates or installs, and always install with --override-channels -c conda-forge.

Files:

• tests/selfapps_entrysmoke_no_interpreter.ps1
• run_setup.bat

**/*.{bat,cmd,ps1,py,yml,json}

📄 CodeRabbit inference engine (CLAUDE.md)

ASCII only -- no emojis, curly quotes, em-dashes

Files:

• tests/selfapps_entrysmoke_no_interpreter.ps1
• run_setup.bat

**/*.{bat,cmd,ps1,py}

📄 CodeRabbit inference engine (CLAUDE.md)

Tag non-obvious constraints: # derived requirement: <why>

Files:

• tests/selfapps_entrysmoke_no_interpreter.ps1
• run_setup.bat

**/*.{py,ps1}

📄 CodeRabbit inference engine (CLAUDE.md)

Python unit tests: tests/test_<topic>.py

Files:

• tests/selfapps_entrysmoke_no_interpreter.ps1

tests/selfapps_*.ps1

📄 CodeRabbit inference engine (CLAUDE.md)

PowerShell scenario tests: tests/selfapps_<scenario>.ps1

Files:

• tests/selfapps_entrysmoke_no_interpreter.ps1

run_setup.bat

📄 CodeRabbit inference engine (AGENTS.md)

run_setup.bat: run_setup.bat must function as a single bootstrapper when dropped beside the application, without requiring committed helper files.
Every branch added to run_setup.bat or its related helpers must have a CI test, including feature flags, fallbacks, recovery paths, and fast/full paths.
Keep bootstrapper log messages synchronized with CI parsers; update workflow checks whenever messages or status summaries change.
All embedded helpers must remain base64-encoded under :define_helper_payloads; changing one requires synchronizing the matching HP_* line and rerunning delimiter checks.
Do not remove tilde prefixes from runtime artifact paths such as ~bootstrap.status.json, ~setup.log, ~environment.lock.txt, and ~env.state.json.

run_setup.bat: 1. Self-contained: no committed helper files; all helpers are base64-encoded inside
the batch file under :define_helper_payloads. To refresh a helper with a canonical
tools/ source, use python tools/sync_payload.py HP_VARNAME tools/the_file.py -- do not
hand-roll the encode/splice/write sequence (see docs/agent-lessons-learned.md's "Embedded
Helper Update Workflow" and the near-miss that motivated automating it).
2. Delimiter-check after every edit:

Files:

• run_setup.bat

**/*.{bat,cmd}

📄 CodeRabbit inference engine (AGENTS.md)

**/*.{bat,cmd}: For batch assignments, use set "VAR=value"; do not use set VAR="value". Quote variables at every filesystem command call site, except NSIS /D= parameters, which must remain unquoted.
Avoid unscoped EnableDelayedExpansion, preserve correct escaping of special characters, and use ASCII plain text.
Run tools/check_delimiters.py and apply its batch heuristics, including caret escaping, quoted filesystem variables, escaped pipes, PowerShell operator placement, and spacing after rem.
Use tools/sync_payload.py as the only sanctioned method for re-encoding embedded HP_* payloads in run_setup.bat; never hand-roll the splice process.

**/*.{bat,cmd}: .bat/.cmd use CRLF (byte-uniform, -text); .ps1 uses CRLF (normalized eol=crlf); everything else LF
call "%CONDA_BAT%" ... for all conda invocations
--override-channels -c conda-forge on all installs
Avoid EnableDelayedExpansion; if needed, wrap tightly
Tilde-prefix temp files (~setup.log, etc.)
Bootstrap must fail fast and explicitly -- no silent fallbacks unless explicitly logged.
All execution must be interpreter-anchored: every tool invocation roots in an explicit
Python executable path (%HP_PY% or %CONDA_PREFIX%\python.exe), never PATH/activation.
Never depend on console scripts during bootstrap (pipreqs, pytest, etc. all require
Scripts/ on PATH and activation state neither is guaranteed) -- use explicit interpreter
paths or direct Python APIs instead.

Files:

• run_setup.bat

CLAUDE.md

📄 CodeRabbit inference engine (AGENTS.md)

Run markdownlint-cli2 CLAUDE.md; only MD029 is intentionally enforced, and new Active Backlog entries must use bullets with the identifier in prose rather than literal ordered-list markers.

Files:

• CLAUDE.md

🧠 Learnings (4)

📚 Learning: 2026-08-09T04:42:17.730Z

Learnt from: mixmansoundude
Repo: mixmansoundude/Python_vs_Windows PR: 426
File: tests/selftest.ps1:79-124
Timestamp: 2026-08-09T04:42:17.730Z
Learning: For PowerShell scenario tests in tests/, use tests/selfapps_<scenario>.ps1 with tests/harness.ps1 and CI registration for standalone full-bootstrap scenarios. Keep closely related extensions of flows already covered by tests/selftest.ps1—including empty-folder and shared stub-flow scenarios—in tests/selftest.ps1, reusing its Invoke-Setup helper and scratch-directory infrastructure instead of adding separate harness or CI wiring.

Applied to files:

• tests/selfapps_entrysmoke_no_interpreter.ps1

📚 Learning: 2026-08-14T16:04:24.941Z

Learnt from: mixmansoundude
Repo: mixmansoundude/Python_vs_Windows PR: 434
File: tests/selfapps_lineending_check.ps1:0-0
Timestamp: 2026-08-14T16:04:24.941Z
Learning: PowerShell scripts named selfapps_*.ps1 that must remain compatible with Windows PowerShell 5.1 should not rely on the automatic $IsWindows variable, which is unavailable there. Use a compatible operating-system check such as [System.Environment]::OSVersion.Platform instead. CI invokes these scripts with pwsh, where $IsWindows is available, so ensure the chosen check works across both environments.

Applied to files:

• tests/selfapps_entrysmoke_no_interpreter.ps1

📚 Learning: 2026-08-01T03:14:00.725Z

Learnt from: mixmansoundude
Repo: mixmansoundude/Python_vs_Windows PR: 408
File: run_setup.bat:1017-1019
Timestamp: 2026-08-01T03:14:00.725Z
Learning: In `run_setup.bat`, `:die` intentionally returns to its caller after setting `HP_BOOTSTRAP_STATE=error`, writing an error status, and releasing the bootstrap lock. The repository currently treats `~bootstrap.status.json` field `state=error` as the authoritative failure signal even when later flow writes `exitCode` 0. Do not request a call-site-specific hard exit without addressing this repository-wide convention.

Applied to files:

• run_setup.bat

📚 Learning: 2026-08-09T04:21:52.930Z

Learnt from: CR
Repo: mixmansoundude/Python_vs_Windows PR: 0
File: AGENTS.md:0-0
Timestamp: 2026-08-09T04:21:52.930Z
Learning: Applies to CLAUDE.md : Run `markdownlint-cli2 CLAUDE.md`; only MD029 is intentionally enforced, and new Active Backlog entries must use bullets with the identifier in prose rather than literal ordered-list markers.

Applied to files:

• CLAUDE.md

🔇 Additional comments (5)

run_setup.bat (1)

1125-1143: LGTM!

tests/selfapps_entrysmoke_no_interpreter.ps1 (1)

10-25: LGTM!

Also applies to: 142-149, 169-191

docs/agent-interconnect.md (1)

984-1021: LGTM!

docs/agent-ndjson.md (1)

984-1003: LGTM!

CLAUDE.md (1)

1002-1043: 📐 Maintainability & Code Quality

Run the required CLAUDE.md validation.

Confirm that markdownlint-cli2 CLAUDE.md passes and that the new Active Backlog entry uses a bullet with the identifier in prose, not a literal ordered-list marker. The selected snippet does not include the parent list marker, so verify this in the full file.

As per coding guidelines: CLAUDE.md requires markdownlint-cli2 CLAUDE.md; only MD029 is intentionally enforced. Based on learnings: new Active Backlog entries must use bullets with the identifier in prose rather than literal ordered-list markers.

Sources: Coding guidelines, Learnings

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📝 Walkthrough

Summary by CodeRabbit

• Bug Fixes

  • Fixed failed Conda environment setup so fallback handling does not run twice.
  • Prevented invalid interpreter selection and duplicate error prompts.
  • Ensured users receive the correct final message when no Python interpreter is available.

• Tests

  • Expanded regression coverage for failed Conda setup and interpreter resolution.

• Documentation

  • Documented the corrected failure flow and expected error handling.

Walkthrough

The Conda creation failure path now jumps directly to :after_env_mode_selection. This prevents fall-through into :conda_create_done. Regression tests and documentation now verify the skipped fallback handling and the final interpreter-resolution error.

Changes

Conda failure flow

Layer / File(s)	Summary
Redirect failed Conda creation run_setup.bat	Failed Conda creation now jumps to :after_env_mode_selection instead of entering :conda_create_done.
Update regression coverage and documentation tests/selfapps_entrysmoke_no_interpreter.ps1, docs/agent-ndjson.md, docs/agent-interconnect.md, CLAUDE.md	Regression checks and documentation now verify that duplicate fallback handling is skipped and that “Active Python interpreter not resolved.” is reported. The remaining non-halting :die path is documented.

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: ⚪ Minimal · up to d5ce8

The change skips a redundant fallback retry after conda creation is exhausted and preserves the intended failure handling path; no actionable merge-blocking risk remains beyond completing normal documentation validation.

Possibly related PRs

• mixmansoundude/Python_vs_Windows#401: Addresses related bootstrapper fallback and error-control flow.
• mixmansoundude/Python_vs_Windows#406: Modifies Conda installation failure handling and related regression coverage.
• mixmansoundude/Python_vs_Windows#412: Addresses related Conda cascade failure handling.

Suggested reviewers: claude

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the change and the specific conda-create exhaustion behavior it fixes.
Description check	✅ Passed	The description accurately explains the fix, scope, regression coverage, and test results.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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• Commit unit tests in branch claude/batch-crlf-strategy-pdi9h5

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[mixmansoundude]

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