Fix agent runner base action sparse checkout

[stranske]

Summary

• use non-cone sparse checkout when reusable Codex/Claude runners fetch .github/actions/agent-run-base
• cover the checkout mode in the shared runner regression test

Root cause

Workflows PR #2744 failed Keepalive next task (Codex) / Codex (keepalive) in run 29066229837/job 86278429797 after the agent run. GitHub could not reload the local action at .workflows-actions/.github/actions/agent-run-base during post-job cleanup. The pre-checkout was sparse-checking a nested action path without sparse-checkout-cone-mode: false, unlike the other local-action sparse checkouts in this repo.

Validation

• python -m pytest -q tests/workflows/test_reusable_run_shared_base.py
• python -m pytest -q tests/scripts/test_validate_workflow_yaml.py
• git diff --check

Fixes keepalive runner infrastructure for #2744.

[coderabbitai]

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Review details

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro

Run ID: d87ce09a-ae3b-41d7-a238-11d1cad297c2

📥 Commits

Reviewing files that changed from the base of the PR and between cb498d7 and 25605bb.

📒 Files selected for processing (3)

• .github/workflows/reusable-claude-run.yml
• .github/workflows/reusable-codex-run.yml
• tests/workflows/test_reusable_run_shared_base.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/fix-agent-run-base-sparse-checkout

---

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[stranske-keepalive]

Workflow source needed

PR #2745 needs either a linked GitHub issue or one valid non-issue Workflow Source before PR metadata automation can manage it safely.

Please do one of:

• Add <!-- meta:issue:123 --> or a normal Closes #123 / Related to #123 line.
• Check one Workflow Source option in the PR body.
• Add a hidden marker such as <!-- workflow-source:local_request -->, <!-- workflow-source:manual_remote -->, <!-- workflow-source:review_followup -->, <!-- workflow-source:sync_campaign -->, or <!-- workflow-source:dependabot -->.
• Add a workflow source label such as workflow:source-direct-pr, workflow:source-local-request, workflow:source-review-followup, workflow:source-sync, or workflow:no-automation.

Once a valid source is present, this warning will not be reposted.

[stranske-keepalive]

Automated Status Summary

Head SHA: 4c35da3
Latest Runs: ⏳ pending — Gate
Required contexts: Gate / gate, Health 45 Agents Guard / guard
Required: core tests (3.12): ⏳ pending, core tests (3.13): ⏳ pending, docker smoke: ⏳ pending, gate: ⏳ pending

Workflow / Job	Result	Logs
(no jobs reported)	⏳ pending	—

Coverage Overview

• Coverage history entries: 1

Coverage Trend

Metric	Value
Current	75.70%
Baseline	85.00%
Delta	-9.30%
Minimum	70.00%
Status	✅ Pass

Top Coverage Hotspots (lowest coverage)

File	Coverage	Missing
scripts/issue_dedup_smoke.py	0.0%	4
scripts/runner_lib/__main__.py	0.0%	3
scripts/validate_template_sync.py	0.0%	77
scripts/langchain/topic_splitter.py	19.1%	57
tools/codex_log_analyzer.py	19.6%	140
scripts/repo_review_round2_runner.py	25.1%	344
scripts/prune_agent_stubs.py	39.7%	26
scripts/repo_review_round1_runner.py	40.7%	133
tools/ensure_workflow_timeout_variables.py	42.1%	74
scripts/sync_label_docs.py	42.9%	64
tools/ci_failure_triage.py	44.2%	123
scripts/repo_review_backlog_scan.py	45.3%	116
scripts/repo_review_body_writer.py	46.5%	86
tools/codex_session_analyzer.py	47.9%	59
scripts/create_verifier_labels.py	48.3%	58

Low Coverage Files (<50.0%)

File	Coverage	Missing
scripts/issue_dedup_smoke.py	0.0%	4
scripts/runner_lib/__main__.py	0.0%	3
scripts/validate_template_sync.py	0.0%	77
scripts/langchain/topic_splitter.py	19.1%	57
tools/codex_log_analyzer.py	19.6%	140
scripts/repo_review_round2_runner.py	25.1%	344
scripts/prune_agent_stubs.py	39.7%	26
scripts/repo_review_round1_runner.py	40.7%	133
tools/ensure_workflow_timeout_variables.py	42.1%	74
scripts/sync_label_docs.py	42.9%	64
tools/ci_failure_triage.py	44.2%	123
scripts/repo_review_backlog_scan.py	45.3%	116
scripts/repo_review_body_writer.py	46.5%	86
tools/codex_session_analyzer.py	47.9%	59
scripts/create_verifier_labels.py	48.3%	58

Updated automatically; will refresh on subsequent CI/Docker completions.

---

Keepalive checklist

Scope

No scope information available

Tasks

• No tasks defined

Acceptance criteria

• No acceptance criteria defined

[Copilot]

Pull request overview

Ensures the reusable Codex/Claude runner workflows pre-checkout the local agent-run-base composite action using non-cone sparse checkout, matching the repo’s established sparse-checkout usage and preventing post-job failures when GitHub reloads the local action during cleanup.

Changes:

• Set sparse-checkout-cone-mode: false on the Workflows run-base action pre-checkout in the reusable Codex runner workflow.
• Set sparse-checkout-cone-mode: false on the Workflows run-base action pre-checkout in the reusable Claude runner workflow.
• Extend the shared runner regression test to assert the non-cone mode setting is present (and parsed as a boolean) for both workflows.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
tests/workflows/test_reusable_run_shared_base.py	Adds a regression assertion that the run-base pre-checkout explicitly disables cone-mode sparse checkout.
.github/workflows/reusable-codex-run.yml	Forces non-cone sparse checkout when pre-checking out .github/actions/agent-run-base into .workflows-actions.
.github/workflows/reusable-claude-run.yml	Forces non-cone sparse checkout when pre-checking out .github/actions/agent-run-base into .workflows-actions.