Provider Capability Matrix

Note

This page is auto-generated from each provider’s capabilities.ts (the same constants the workflow engine reads to enforce provider-specific behavior). Do not edit it by hand — run bun run generate:capability-matrix. A capability change fails bun run validate until this page is regenerated.

Each column is a registered provider id (the value you set as provider: in a workflow or .archon/config.yaml). A ✅ means Archon translates the corresponding capability for that provider; a ❌ means the capability is unsupported. Unsupported behavior is feature-specific: some optional fields are ignored with a warning, while strict contracts fail closed. In particular, context.resume rejects an explicitly unsupported provider at load time and an implicitly resolved one at runtime.

Providers

• claude — Claude (Anthropic)
• codex — Codex (OpenAI)
• opencode — OpenCode (community) (community provider)
• pi — Pi (community) (community provider)
• copilot — Copilot (GitHub) (community provider)

Capabilities

Capability	claude	codex	opencode	pi	copilot
Session resume	✅	✅	✅	✅	✅
Immutable session fork (context.resume)	✅	❌	❌	✅	❌
MCP servers (mcp:)	✅	✅	❌	❌	✅
Hooks (hooks:)	✅	❌	❌	❌	❌
Skills (skills:)	✅	❌	❌	✅	✅
Inline sub-agents (agents:)	✅	❌	✅¹	❌	✅
Tool restrictions (allowed_tools/denied_tools)	✅	❌	✅	✅	✅
Structured output (output_format)	enforced	enforced	enforced	best-effort	best-effort
Env injection (env:)	✅	✅	✅	✅	✅
Cost control (maxBudgetUsd)	✅	❌	❌	❌	❌
Effort control (effort)	✅	✅	❌	✅	✅
Thinking control (thinking)	✅	❌	❌	✅	✅
Fallback model (fallbackModel)	✅	❌	❌	❌	❌
Sandbox (sandbox)	✅	❌	❌	❌	❌
Setting sources (settingSources)	✅	❌	❌	❌	❌
In-process native tools	✅	❌	❌	✅	❌
Container exec (folder-project container backend)	✅	❌	❌	❌	❌

Caveats

• ¹ opencode — Inline sub-agents (agents:) — Config-file-based agent selection (named agents from opencode.json) with per-call model/tools overrides — not inline sub-agent definitions.

Legend

• ✅ / ❌ — the capability is supported or unsupported for this provider.
• ✅¹ (superscript) — supported, but with semantics that differ from the headline meaning of the axis — see Caveats.
• Structured output — enforced (the SDK/backend grammar-constrains decoding), best-effort (schema appended to the prompt, then validated + re-asked up to 3×), or ❌ (unsupported). See AI Assistants → Structured output guarantees.
• In-process native tools — the provider can register Archon NativeTools for a turn (gates auto-injection of Archon’s manage_run tool into project-scoped chat).

For per-provider field-level notes (YAML syntax, caveats), see the AI Assistants guide.