Capabilities matrix

Archived comparison document. Preserved for historical context; not part of the current normative reference/ contract.

One-glance view of which features each built-in adapter supports. Every row is the adapter's declared capabilities record — the same data you get at runtime via client.adapter(agent).capabilities.

Legend: ✓ supported · · not supported · ~ partial / virtual-only.

| Feature / Agent | claude | codex | gemini | copilot | cursor | opencode | opencode-http | openclaw | hermes | pi | omp | qwen | agent-mux-remote | |------------------------|:-:|:-:|:-:|:-:|:-:|:-:|:-:|:-:|:-:|:-:|:-:|:-:|:-:| | Resume session | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | | Fork session | ✓ | ✓ | ~ | · | ~ | ~ | ✓ | ~ | · | · | · | ~ | ✓ | | Multi-turn | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | | Text streaming | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | | Thinking streaming | ✓ | ✓ | · | · | · | · | · | · | · | · | · | ~ | ~ | | Tool-call streaming | ✓ | ✓ | ✓ | ~ | ✓ | ✓ | ✓ | ✓ | ~ | ~ | ~ | ✓ | ✓ | | Native tools | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | | Parallel tool calls | ✓ | ✓ | ✓ | · | ✓ | ✓ | ✓ | · | · | · | · | ✓ | ~ | | MCP plugins | ✓ | ✓ | ✓ | · | ✓ | ✓ | ✓ | ✓ | · | · | · | ✓ | ~ | | Native hooks | ✓ | ✓ | ✓ | · | ~ | ~ | ~ | ~ | · | · | · | ~ | · | | Virtual hooks | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | | Subagent dispatch | ✓ | · | · | · | · | · | ✓ | · | · | · | · | · | ~ | | Skills / AGENTS.md | ✓ | · | · | · | · | · | ✓ | · | · | · | · | · | · | | Image input | ✓ | · | ✓ | · | · | · | ✓ | · | · | · | · | ~ | ~ | | File attachments | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | | Approval (yolo/prompt) | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ~ | | PTY required | · | · | · | · | · | · | · | · | · | · | · | · | · | | Session persistence | file | file | file | file | file | file | file | file | file | file | file | file | transport | | Cost events | ✓ | ✓ | ✓ | · | ~ | ~ | ~ | · | · | · | · | ~ | ~ | | Invocation modes | local, docker, ssh, k8s — all adapters (chosen per-run via RunOptions.invocation). |

Advanced Orchestration & Streaming Modes

This matrix covers the detailed discovery for how each adapter handles streaming, interactivity, and queueing across the 16 mode combinations (Interactive/Non-Interactive × JSONL/Text × Stream/Non-Stream).

Execution Modes

| Mode | Format | Stream | claude | codex | gemini | copilot | cursor | opencode | opencode-http | openclaw | hermes | pi | omp | qwen | agent-mux-remote | |:---:|:---:|:-:|:-:|:-:|:-:|:-:|:-:|:-:|:-:|:-:|:-:|:-:|:-:|:-:|:-:| | **Interactive** | Text | **Stream** | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | | | Text | **Non-Str** | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | | | JSONL | **Stream** | ✓ | ✓ | · | · | · | · | · | · | · | · | · | · | ~ | | | JSONL | **Non-Str** | ✓ | · | · | · | · | · | · | · | · | · | · | · | ~ | | **Non-Interactive** | Text | **Stream** | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | | | Text | **Non-Str** | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | | | JSONL | **Stream** | ✓ | ✓ | · | · | · | · | · | · | · | · | · | · | ~ | | | JSONL | **Non-Str** | ✓ | · | · | · | · | · | · | · | · | · | · | · | ~ |

Steering & Queueing Support

Steering (injecting messages mid-run) and Queueing (queuing async messages) capabilities depend on the execution mode selected above.

| Feature / Mode | Format | Stream | claude | codex | gemini | copilot | cursor | opencode | opencode-http | openclaw | hermes | pi | omp | qwen | agent-mux-remote | |:---:|:---:|:-:|:-:|:-:|:-:|:-:|:-:|:-:|:-:|:-:|:-:|:-:|:-:|:-:|:-:| | **Steering** (Interactive) | Text | **Stream** | ✓ | ✓ | ✓ | · | · | · | · | · | · | · | · | · | ~ | | | Text | **Non-Str** | ✓ | ✓ | ✓ | · | · | · | · | · | · | · | · | · | ~ | | | JSONL | **Stream** | ✓ | ✓ | · | · | · | · | · | · | · | · | · | · | ~ | | | JSONL | **Non-Str** | ✓ | · | · | · | · | · | · | · | · | · | · | · | ~ | | **Queueing** (Interactive) | Text | **Stream** | · | ✓ | ✓ | · | · | · | · | · | · | · | · | · | ~ | | | Text | **Non-Str** | · | ✓ | ✓ | · | · | · | · | · | · | · | · | · | ~ | | | JSONL | **Stream** | · | ✓ | · | · | · | · | · | · | · | · | · | · | ~ | | | JSONL | **Non-Str** | · | · | · | · | · | · | · | · | · | · | · | · | ~ |

*(Non-Interactive support matches the Interactive table above identically for Steering and Queueing)*

Current runtime note: the concrete RunHandle.queue() / RunHandle.steer() implementation is wired through the stdin-backed live-run path. Deferred delivery currently flushes on observed tool_result / tool_error, message_stop, and turn_end events. Adapters that are modeled as remote or programmatic transports still need dedicated transport-native wiring before this matrix can be treated as fully enforced runtime behavior for those paths.

| Feature / Agent | claude | codex | gemini | copilot | cursor | opencode | opencode-http | openclaw | hermes | pi | omp | qwen | agent-mux-remote | |-------------------------------|:-:|:-:|:-:|:-:|:-:|:-:|:-:|:-:|:-:|:-:|:-:|:-:|:-:| | **Async Loop Tools** | ✓ | · | · | · | · | · | · | · | · | · | · | · | ~ |

How this is derived

Each adapter declares AgentCapabilities (see packages/agent-mux/core/src/capabilities.ts) and ModelCapabilities[]. The matrix above is a human-readable summary; treat the declared capability objects as the source of truth for runtime feature gating:

const caps = client.adapter('claude-code').capabilities;
if (caps.supportsThinking) { /* render thinking UI */ }
if (caps.supportsMCP)      { /* expose MCP plugin settings */ }

Session persistence

file adapters store transcripts as JSONL (or equivalent) under the harness's own session directory — agent-mux reads them back via sessions.list() / sessions.read() without re-parsing through the harness binary.

transport (agent-mux-remote) delegates persistence to the remote endpoint: sessions live on the remote host and are fetched on demand.

Partial (~) notes

byte-incrementally; the UI sees one delta per reasoning turn.

remote endpoint is running an adapter that supports MCP.

every adapter. Use them when native hooks aren't available or when you want the same hook to fire across multiple harnesses.

The cost event still fires with totalUsd: 0 in that case.

• **thinking streaming — qwen**: emitted as a distinct block but not
• **MCP — agent-mux-remote**: routed over the transport; supported iff the
• **virtual hooks**: implemented by agent-mux off the event stream for
• **cost — cursor / opencode / qwen**: tokens reported, USD not always.