# Copilotkit Foundation

> Use when building a multi-platform chat/channel agent runtime (Slack, Teams, Discord, Telegram, WhatsApp) or cross-platform UI bridge — dynamic Proxy subscriber fanouts, isolated error boundaries between runners and renderers, symbol-branded terminal delivery errors, durable action registry rehydration with payload-limited value caching, thread promise conversion boundaries, stream null-string sanitization for LangGraph tool interrupts, sentinel-based Markdown-to-mrkdwn pipelines, per-platform transport planes (Discord ack-race chunking, Teams proactive turns + Adaptive Cards, WhatsApp signed webhooks), core RunHandler run-loop contracts, realtime-gateway connection-health machinery, channel-delivery packet transport stack, and universal UI Intermediate Representation (IR) AST expanders. Source code and direct tests are ground truth; references carry decisive excerpts and graph retrieval.

- Skill: `ryan-brosas/copilotkit-foundation` (Agent Skill, multi-file: 39 files)
- Install (CLI): `npx skillmds@latest add ryan-brosas/copilotkit-foundation`
- Raw SKILL.md: https://api.skillmd.com/api/skills/ryan-brosas/copilotkit-foundation/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: AI & ML
- Author: ryan-brosas (https://skillmd.com/u/ryan-brosas)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/ryan-brosas/copilotkit-foundation

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# copilotkit: Multi-Channel Agent & UI Runtime Foundation

## Foundation contract

This is a cold, source-specific foundation, not an operational procedure. It is
historical, revision-pinned evidence rather than timeless guidance. Current
project source, tests, requirements, and runtime behavior outrank this
projection and decide what ships.

## Provenance and revision

- Source record: `copilotkit`; portable upstream identity, license, coverage caveats, and retrieval history are preserved in the index.
- Recorded revision: `main@e9387e04835545c45744b791aee7c9c03520be31`.
- Full provenance, coverage caveats, boundaries, and preserved evidence:
  `references/index.md`.

## Topic map

- Representative topics: Agent Run Loop & Event Fanout; Delivery Error &
  Promise Boundaries; UI Actions & State Rehydration; Channel Formatting & UI
  AST; Telegram Transport Plane; Discord Transport Plane; Teams Transport
  Plane; Teams Rendering Plane.
- Scope and retrieval questions: `references/index.md#use-this-for`.
- Complete capsule chooser: `references/index.md#load-the-matching-source-dump`.
- Detailed grouped map: `references/index.md#capsule-map`.
- Source limitations and portability boundaries: `references/index.md#boundaries`.

## Retrieval

Open the index, choose one capsule matching the active question, and load only
that capsule. Revalidate its cited source and revision before relying on it. Do
not bulk-load the inventory, treat historical claims as current truth, or apply
this foundation as a procedure.