Illustrates NetworkAccess. Gated by `send_notification` (default false) at the workflow-step level via `when` (see main-workflow.cwl), so with the bundled sample job this step is always skipped and no network call is ever attempted. `send_notification` is declared here with no `inputBinding` purely so the workflow's `when` expression can read it.

Extracts all `.txt` reports from the checksum-verified tar.gz corpus archive. Demonstrates: baseCommand as an array (fixed leading arguments), ResourceRequirement, array-of-File outputs via glob, and capturing the tool's own stdout as a log file.

Gzips the persisted summary file. Only runs when the workflow step's `when` condition is true (see main-workflow.cwl). `total_matches` and `compress_threshold` are declared here with no `inputBinding` purely so the workflow's `when` expression can read them - they never reach the actual command line. Demonstrates: ToolTimeLimit, WorkReuse, and \"control-only\" step inputs.

Materializes a runtime string (`summary_text`) into a real file using InitialWorkDirRequirement, then copies it to a stable output name. Demonstrates the \"Creating Files at Runtime\" pattern from the CWL User Guide: `entry: $(inputs.summary_text)` writes the parameter reference's value verbatim into `entryname`.

Recursively lists the contents of the `reference_dir` Directory input and returns the file names as a string array, without running any external command. Demonstrates: ExpressionTool, Directory input, LoadListingRequirement (deep_listing), and a multi-line `${...}` JS expression with a helper function.

Confirms the SHA-256 checksum of the corpus archive matches its accompanying `.sha256` sidecar file (declared via `secondaryFiles`) before extraction proceeds. On success it passes the *same* File object through as `verified_archive`, which the workflow uses to force a real data dependency (extraction only starts once verification has succeeded).

Demonstrates: secondaryFiles, successCodes default (mismatch = real failure), simple parameter references with array indexing (`secondaryFiles[0].path`, no InlineJavascriptRequirement needed), and an `outputEval` that passes an input straight through as an output.

Nested Workflow used as a single step of main-workflow.cwl (requires the parent to declare SubworkflowFeatureRequirement). Scatters search-tool.cwl over every extracted text file, then aggregates the per-file counts. Demonstrates: ScatterFeatureRequirement + scatterMethod, and a Workflow whose own inputs/outputs use SchemaDefRequirement custom types.