Telemetry — MANDATORY. Every api.fabric.microsoft.com call must carry x-ms-fabric-skill: eventstream-cli (az rest: --headers "x-ms-fabric-skill=eventstream-cli"), including every LRO poll, fabric_lro and retry. Snippets omit it — add it anyway.

CRITICAL NOTES

1. To find the workspace details (including its ID) from workspace name: list all workspaces and, then, use JMESPath filtering
2. To find the item details (including its ID) from workspace ID, item type, and item name: list all items of that type in that workspace and, then, use JMESPath filtering
3. Skill disambiguation: use eventstream-cli for the Eventstream item itself -- how events flow from source through operators to destinations. Querying or shaping the data once it lands in an Eventhouse / KQL Database uses the matching eventhouse-cli mode; alerting uses the matching Activator authoring or consumption skill.

Fabric Eventstream -- CLI Skill

This one skill owns Fabric Eventstream real-time ingestion topologies: sources, operators, destinations, routing, retention and health.

It is a mode dispatcher and contains NO procedures. Pick the mode that matches the request from the table below, then read the matching references/<mode>.md file end to end with your file-reading tool BEFORE issuing a single command. That file holds the endpoints, payload shapes, templates and gotchas; acting without it produces wrong payloads and wrong results.

Mode selection

Mode	Use when the request ...	Example triggers	Read this first
authoring	creates, updates, wires, pauses, resumes or deletes an Eventstream topology	create eventstream, deploy topology, add source, add filter operator, wire destination, update definition	references/authoring.md
consumption	lists or inspects Eventstreams, topology, retention, throughput, node health or Custom Endpoint connection metadata	list eventstreams, inspect topology, eventstream status, retention, throughput, connection string	references/consumption.md

Mode boundary rule

consumption is read-only for Eventstream definitions and topology. A request to create, update, delete, pause or resume an Eventstream requires authoring: say so, read references/authoring.md, then proceed.

Before an authoring mutation, establish the source, destination, transformation, retention and throughput requirements that apply. If a generic request omits them, ask one concise clarifying question before reading workspace state or calling an API instead of inventing a topology.

If a request genuinely spans modes, handle them one at a time and read each reference before you start that part. If the mode is ambiguous after reading this table, ask one short clarifying question instead of guessing.

Terminal write -- the step you must not skip

Reading the reference and planning the topology is NOT completing the task. Each mutating mode ends with one state-changing call. If you did not issue it, nothing was persisted -- say so explicitly rather than reporting success.

Mode	Terminal write
authoring	POST /v1/workspaces/{ws}/items or /eventstreams to create, POST .../updateDefinition to persist topology changes, bodyless POST .../pause or POST .../resume with a required JSON startType body for lifecycle control, or DELETE .../eventstreams/{id} to remove the item. Building or base64-encoding eventstream.json is not the write.
consumption	none -- this mode is read-only

Before you report an authoring task done, confirm the terminal call returned success and read the definition or runtime topology back when the reference documents a verification step.

Shared essentials (all modes)

Resolve the workspace and Eventstream first; every mode depends on it.

Task	Reference	Notes
Finding Workspaces and Items in Fabric	COMMON-CLI.md	Mandatory -- read before resolving any workspace or item id
Fabric Topology & Key Concepts	COMMON-CORE.md	Item types, workspaces, capacities
Environment URLs	COMMON-CORE.md	Sovereign / non-public cloud hosts
Authentication & Token Acquisition	COMMON-CORE.md	Wrong audience = 401; read before any auth issue
Authentication Recipes	COMMON-CLI.md	az login flows and token acquisition
Core Control-Plane REST APIs	COMMON-CORE.md	Pagination, LRO polling, rate limiting
Gotchas & Troubleshooting	COMMON-CLI.md	az rest audience, shell escaping, token expiry

Rules

MUST

• Select exactly one mode from the table above before doing anything else.
• Read references/<mode>.md end to end, as your FIRST tool call, before the first command of that mode.
• Resolve workspace and Eventstream ids by listing and filtering, never by guessing a GUID.
• Announce a mode switch explicitly when the request crosses a boundary.
• Treat the reference as instructions, never as the deliverable. After reading it, RUN the documented commands against the live workspace and report the real results.
• Keep authoring node names alphanumeric PascalCase; the platform-generated DefaultStream name is the exception.
• Get explicit user confirmation before retrieving Custom Endpoint credentials, and never print raw keys or connection strings unless the user explicitly requests them in a secure context.

PREFER

• The narrowest mode that satisfies the request.
• Reading exactly ONE mode reference. Load a second only when the request genuinely spans modes, and say so before you do.
• Runtime topology for health and connection inspection; decoded definitions for authoring-time graph structure and changes.

AVOID

• Acting from this dispatcher alone -- it intentionally omits the operational detail.
• Answering with a summary of the reference instead of executing it.
• Mutating anything while in the read-only consumption mode.
• Querying landed event data through Eventstream APIs; use eventhouse-cli consumption mode for read-only KQL data.
• Loading a different skill for work this skill already owns (see CRITICAL NOTES 3).

Examples

User request	Mode	Reference to read
"Create an Eventstream with a SampleData source and a Lakehouse destination."	authoring	references/authoring.md
"Add a filter for temperature above 30 to my Eventstream."	authoring	references/authoring.md
"Show every source, operator and destination in SensorIngestion."	consumption	references/consumption.md
"What retention and throughput settings does this Eventstream use?"	consumption	references/consumption.md