variable-library-cli

1> **Telemetry — MANDATORY.** Every `api.fabric.microsoft.com` call must carry
2> `x-ms-fabric-skill: variable-library-cli` (`az rest`: `--headers "x-ms-fabric-skill=variable-library-cli"`),
3> including every LRO poll, `fabric_lro` and retry. Snippets omit it — add it anyway.
4 
5> **CRITICAL NOTES**
6> 1. To find the workspace details (including its ID) from a workspace name: list all workspaces, then use JMESPath filtering.
7> 2. To find the item details (including its ID) from a workspace ID, item type, and item name: list all items of that type in that workspace, then use JMESPath filtering.
8> 3. Variable Library has two planes: definition files in Git, and active value set item state in the workspace. Do not treat the active value set as a Git edit. The definition plane is `authoring`; the item-state plane is `operations`.
9> 4. Variable Library definition requests must omit the `format` field entirely. Do not send `format: null`.
10> 5. **Skill disambiguation**: use `variable-library-cli` for every Variable Library concern, including the Variable Library side of a consumer reference. Deep authoring of the consumer item itself belongs elsewhere: pipelines to `pipeline-migration`, notebooks to `spark-cli`, Dataflow Gen2 to `dataflows-cli`, Git lifecycle to `git-integration-operations-cli`, deployment pipeline mechanics to `deployment-pipelines-authoring-cli`.
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