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----
-name: execute-pipe
-intent: parallel, pipeline, pipe, fan-out, concurrent, batch, etl, transform, compose
-description: Use execute_code pipeline stages for sequential data processing, parallel fan-out, and ETL workflows.
----
-
-# Execute Pipeline Patterns
-
-## Principle: smart data, dumb code
-
-The primitive stays simple. Complexity lives in the data schema and the skill (here), not in the tool itself. Design pipelines around data shape, not around clever tool use.
-
-## execute_code: the unified primitive
-
-`execute_code` accepts a `steps` array of pipeline stages. Stages run sequentially, each stage's stdout fed to the next stage's stdin. A single stage returning raw output is the degenerate case.
-
-Each stage is one of:
-- `{code, language}` — inline code (default: bash)
-- `{tool, args}` — named script from `ollie/t`; language detected from shebang
-- `{parallel: [steps]}` — concurrent fan-out; outputs concatenated in submission order, fed to next stage
-
-Tool steps and inline code steps can be mixed freely. Tool steps are trusted (no pattern validation); inline code steps are validated before execution.
-
-## Language selection
-
-| Step type | How language is determined |
-|---|---|
-| `{code}` | `language` field; defaults to `bash` if absent |
-| `{tool}` | shebang line in the script; `language` field is ignored |
-
-Supported `language` values for inline code: `bash`, `python3`, `perl`, `lua`, `awk`, `sed`, `jq`, `ed`, `expect`, `bc`.
-
-## Single stage (degenerate case)
-
-Raw output, no headers:
-```json
-{"steps": [{"code": "wc -l file.txt"}]}
-```
-
-## Sequential pipeline
-
-Each stage's stdout becomes the next stage's stdin:
-```json
-{"steps": [
-  {"code": "grep ERROR app.log"},
-  {"code": "sort"},
-  {"code": "uniq -c"}
-]}
-```
-
-Tool stage:
-```json
-{"steps": [
-  {"tool": "fetch-metrics.sh", "args": ["--last=1h"]},
-  {"code": "jq '.[] | select(.latency > 500)'"}
-]}
-```
-
-## Parallel stage
-
-A `{parallel: [...]}` stage fans out concurrently. Outputs are concatenated in submission order and fed as a single stream to the next stage:
-
-```json
-{"steps": [
-  {"parallel": [
-    {"tool": "fetch-app1.sh"},
-    {"tool": "fetch-app2.sh"},
-    {"code": "cat /var/log/app3.log"}
-  ]},
-  {"code": "grep ERROR"},
-  {"code": "wc -l"}
-]}
-```
-
-**Rule: use the same tool across all parallel steps in a stage.** Parallel steps that produce the same output schema concatenate cleanly. Parallel steps with disparate schemas produce an incoherent stream.
-
-## ETL pattern: disparate schemas
-
-When parallel steps produce different output schemas, normalize each before merging:
-
-```json
-{"steps": [
-  {"parallel": [
-    {"code": "jq -r '.name' users.json"},
-    {"code": "awk -F: '{print $1}' /etc/passwd"}
-  ]},
-  {"code": "sort -u"},
-  {"tool": "dedup.py"}
-]}
-```
-
-If normalization requires multiple steps, extract it as a named tool in `ollie/t`.
-
-## Timeout
-
-`timeout` applies per stage (default: 30s). A pipeline of N stages can run up to N × timeout seconds total. Set explicitly for long-running stages.
-
-## When to use which pattern
-
-| Situation | Pattern |
-|---|---|
-| One independent operation | single stage |
-| N independent operations, same output schema | `{parallel: [...]}` stage |
-| N operations feeding one transform | parallel first stage, then sequential |
-| Multi-step data transform | sequential stages |
-| Reusable transform logic | `{tool}` stage referencing a named script in `ollie/t` |