Copilot Studio — Shared Project Context

You are working inside a Copilot Studio agent project. All YAML files have the .mcs.yml extension.

Project Structure

<agent-dir>/           # Auto-discover via Glob: **/agent.mcs.yml
├── agent.mcs.yml      # Agent metadata (display name, schema version)
├── settings.mcs.yml   # Agent settings (schemaName, GenerativeActionsEnabled, instructions)
├── topics/            # Conversation topics (AdaptiveDialog YAML files)
├── actions/           # Connector-based actions (TaskDialog YAML files)
├── knowledge/         # Knowledge sources (KnowledgeSourceConfiguration YAML files)
├── variables/         # Global variables (GlobalVariableComponent YAML files)
└── agents/            # Child agents (AgentDialog YAML files, each in its own subfolder)

Schema Lookup Script

When you write new YAML files, be sure to use the schema lookup script to understand the schema, including mandatory fields, definitions, and references. The script is located at ${CLAUDESKILLDIR}/../../scripts/schema-lookup.bundle.js, and you can use it in the terminal as follows:

node ${CLAUDE_SKILL_DIR}/../../scripts/schema-lookup.bundle.js search trigger             # Search by keyword
node ${CLAUDE_SKILL_DIR}/../../scripts/schema-lookup.bundle.js lookup SendActivity        # Look up a definition
node ${CLAUDE_SKILL_DIR}/../../scripts/schema-lookup.bundle.js resolve AdaptiveDialog     # Resolve with $refs
node ${CLAUDE_SKILL_DIR}/../../scripts/schema-lookup.bundle.js kinds                      # List all valid kind values
node ${CLAUDE_SKILL_DIR}/../../scripts/schema-lookup.bundle.js summary Question           # Compact overview
node ${CLAUDE_SKILL_DIR}/../../scripts/schema-lookup.bundle.js validate <file.yml>        # Validate a YAML file

If you already know the specific definition you want to look up, use lookup. If you want to explore the schema around a certain topic, use search or summary. Always check the schema before writing YAML to ensure you include all required fields and use valid values.

NEVER load the full schema file (reference/bot.schema.yaml-authoring.json) — it's too long. Always use the script above.

Connector Lookup Script

The connector lookup script is at ${CLAUDESKILLDIR}/../../scripts/connector-lookup.bundle.js. Use it for any questions about connectors, actions, their inputs, and outputs:

node ${CLAUDE_SKILL_DIR}/../../scripts/connector-lookup.bundle.js list                                 # List all connectors with operation counts
node ${CLAUDE_SKILL_DIR}/../../scripts/connector-lookup.bundle.js operations <connector>               # List operations for a connector
node ${CLAUDE_SKILL_DIR}/../../scripts/connector-lookup.bundle.js operation <connector> <operationId>  # Full details of one operation (inputs/outputs)
node ${CLAUDE_SKILL_DIR}/../../scripts/connector-lookup.bundle.js search <keyword>                     # Search operations across all connectors

<connector> matches by API name (shared_office365) or partial display name (outlook).

When to use this: When you need to understand available connectors, what inputs/outputs an action has, or what operations are available. The action YAML files in the agent only show configured inputs — connector-lookup shows the full connector definition with all available inputs and outputs.

Skill-First Rule (VERY IMPORTANT)

You have access to specialized skills that handle YAML creation, editing, validation, and testing. ALWAYS invoke the matching skill instead of doing it manually. Skills contain correct templates, schema validation, and patterns. Doing it manually risks hallucinated kind: values, missing required fields, and broken YAML. Example skills include /copilot-studio:new-topic for creating new topics, /copilot-studio:add-action for adding connector actions and tools, and /copilot-studio:validate for validating YAML files.

If no skill matches, only then work manually — but always validate with /copilot-studio:validate afterward.

Key Conventions

• Agent Discovery: NEVER hardcode agent names. Always Glob: **/agent.mcs.yml.
• ID Generation: Random alphanumeric, 6-8 chars after prefix (e.g., sendMessage_g5Ls09).
• Template REPLACE: Always replace REPLACE placeholder IDs with unique random IDs.
• Power Fx: Expressions start with =. String interpolation uses {}. Only use supported functions (check int-reference skill).
• Generative Orchestration: When GenerativeActionsEnabled: true, use topic inputs/outputs instead of hardcoded questions/messages.