chore: import upstream snapshot with attribution

apps/sim/content/blog/copilot/index.mdx

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+---
+slug: copilot
+title: 'Inside Sim Copilot — architecture, benchmarks, and how it fits'
+description: 'A technical overview of Sim Copilot: the architecture behind it, our early benchmarks, and how Copilot integrates with agentic workflows in Sim.'
+date: 2025-11-08
+updated: 2025-11-08
+authors:
+  - sid
+readingTime: 7
+tags: [Copilot, AI Assistant, Benchmarks, Architecture, Sim]
+ogImage: /blog/copilot/cover.png
+ogAlt: 'Sim Copilot technical overview'
+about: ['AI Assistants', 'Agentic Workflows', 'Retrieval Augmented Generation']
+timeRequired: PT7M
+canonical: https://www.sim.ai/blog/copilot
+featured: false
+draft: true
+---
+
+> This is a technical deep‑dive scaffold for Sim Copilot. We’ll keep updating it as we publish more results and open up additional capabilities.
+
+## TL;DR
+
+- Copilot is a context‑aware assistant embedded into the Sim editor.  
+- It has first‑class access (with user approval) to workflows, blocks, logs, and docs.  
+- The system is retrieval‑centric with strong guardrails and deterministic execution paths.  
+
+## Architecture at a glance
+
+1. Intent understanding  
+   - Lightweight classifier + instruction parser directs requests into tools.  
+2. Context assembly  
+   - Indexed sources (workflows, blocks, logs, docs) with semantic and lexical signals.  
+   - Safety filters for scope + permission checks.  
+3. Tooling and actions  
+   - Read‑only tools (explain, compare, search), propose‑changes tools, and execution tools.  
+4. Response synthesis  
+   - Deterministic templates for diffs, plans, and explanations.  
+5. Human‑in‑the‑loop  
+   - All writes gated behind explicit user approval.
+
+```mermaid
+flowchart LR
+  U[User] --> I(Intent)
+  I --> C(Context Builder)
+  C -->|RAG| R[Retriever]
+  R --> T(Tools)
+  T --> S(Response Synth)
+  S --> U
+```
+
+## Retrieval and grounding
+
+- Sources: workspace workflows, block metadata, execution logs, and product docs.  
+- Indexing: hybrid scoring (BM25 + embeddings) with recency decay and per‑source caps.  
+- Normalization: chunking with stable anchors so diffs remain line‑referential.  
+
+## Early benchmarks (scaffold)
+
+> Numbers below are placeholders for the structure; we’ll replace with full runs.
+
+| Task                                | Top‑1 Retrieval@K | Edit Accuracy | Time (p50) |
+| ----------------------------------- | -----------------:| ------------: | ---------: |
+| Explain a workflow block            | 92%               | 88%           | 1.2s       |
+| Propose a safe fix for an error     | 78%               | 70%           | 2.1s       |
+| Generate a new block configuration  | 74%               | 65%           | 2.6s       |
+| Find relevant execution logs        | 90%               | 84%           | 1.4s       |
+
+Measurement notes:
+
+- Retrieval@K: correctness of the top candidate chunk for a labeled query.  
+- Edit Accuracy: human‑validated acceptance rate for proposed changes.  
+- Time: server‑side latency (excludes model cold‑start).  
+
+## Guardrails and safety
+
+- Scope enforcement: actions limited to the open workspace with explicit user triggers.  
+- Sensitive data policies and redaction in logs.  
+- Proposal mode: diffs are reviewed and applied only on user approval.  
+
+## How Copilot fits into Sim
+
+- In‑editor assistant for building and editing workflows.  
+- Shortcut to documentation and examples with live context from your canvas.  
+- Bridge to evaluation: Copilot can set up test runs and compare outputs side‑by‑side.  
+- Works with the same permissions model you already use in Sim.  
+
+## Roadmap (high‑level)
+
+- Multi‑turn plans with sub‑tasks and rollback.  
+- Deeper evaluation harness and dataset management.  
+- First‑party tool plugins for common blocks and providers.  
+
+## Repro and transparency
+
+- We’ll publish a benchmark harness and anonymized evaluation sets.  
+- Expect a detailed methodology post as we widen the beta.  
+
+— Sid @ Sim
+
+