[semaphoreio/sem-ai debug-pipeline]: stuck in initializing almost always means a YAML error, validate .semaphore/semaphore.yml before anything else. result_reason stuck with no blocks scheduled means no agent was available, check the agent types assigned to the pipeline. Failed pipelines with no blocks ever scheduled are pre-flight check failures at init, inspect the pre-flight check output. Cache errors are environment issues, not code: cache not configured.

Context: A pipeline sits in initializing forever, or fails with result_reason stuck and no blocks ever run.

## Matched source
Source: Source: https://github.com/semaphoreio/sem-ai/blob/HEAD/assets/plugin/skills/debug-pipeline/SKILL.md
Original query: "Semaphore CI: pipeline stuck initializing / result_reason stuck"
Key terms: initializing, pipeline, reason, result, semaphore, stuck