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    "title": "GAP-MCPC-002: MCP Channel Outbound Messaging",
    "displayName": "GAP-MCPC-002: MCP Channel Outbound Messaging",
    "slug": "docs/harness-features-backlog/gaps/mcp-channels/gap-mcpc-002",
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    "article": "\n# GAP-MCPC-002: MCP Channel Outbound Messaging\n\n| Field | Value |\n|-------|-------|\n| Category | mcp-channels |\n| Priority | High |\n| Effort | M |\n| Status | Missing |\n\n## Description\nSend messages from orchestration runs to external channels (Slack, Discord, email)\nvia MCP server tools. Enable processes to notify operators, report progress, and\nshare results through messaging platforms.\n\n## CC Implementation\nCC's outbound messaging works through MCP tools exposed by channel servers:\n- Slack MCP server exposes `slack_send_message`, `slack_send_message_draft`,\n  `slack_schedule_message`\n- Gmail MCP server exposes `gmail_create_draft`\n- Calendar MCP server exposes `gcal_create_event`\n- The model decides which channel's tool to use based on context\n- Channel tools are regular MCP tools -- no special plumbing needed once MCP\n  client is connected\n\n## Current State\nNo MCP client capability. Cannot invoke external MCP server tools.\nProcesses cannot send messages to external systems.\n\n## Target State\nProcesses can invoke channel MCP tools as effects:\n```javascript\nawait ctx.task(defineTask('notify-slack', () => ({\n  kind: 'mcp-tool',\n  mcpServer: 'slack',\n  tool: 'slack_send_message',\n  args: { channel: '#orchestration', text: 'Run completed: 128 gaps generated' }\n})));\n```\n\n## Dependencies\n- [GAP-MCPC-001](GAP-MCPC-001.md) -- MCP channel connection\n- [GAP-TOOLS-025](../tools-capabilities/GAP-TOOLS-025.md) -- MCP client capability\n\n## Key Files\n| Component | Path |\n|-----------|------|\n| CC MCP tools | Available as deferred tools via `mcp__claude_ai_Slack__*` |\n\n## Recommendation\nPhase 3. Once MCP client is working (GAP-TOOLS-025), channel outbound is\nessentially free -- just invoke the channel server's tools.\n",
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