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102 lines
3.8 KiB
Text
102 lines
3.8 KiB
Text
---
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title: "Session Event Coverage"
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description: "What appears in your session transcript for each agent."
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icon: "table"
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---
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Each coding agent outputs events in its own native format. The sandbox-agent converts these into a [universal event schema](/docs/universal-schema), giving you a consistent session transcript regardless of which agent you use.
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This page shows which agent capabilities appear in the universal event stream. All agents retain their full native capabilities—this only reflects what's normalized into the universal schema.
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## Coverage Matrix
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| Feature | Claude | Codex | OpenCode | Amp |
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|--------------------|:------:|:-----:|:------------:|:------------:|
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| Stability | Stable | Stable| Experimental | Experimental |
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| Text Messages | ✓ | ✓ | ✓ | ✓ |
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| Tool Calls | ✓ | ✓ | ✓ | ✓ |
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| Tool Results | ✓ | ✓ | ✓ | ✓ |
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| Questions (HITL) | ✓ | | ✓ | |
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| Permissions (HITL) | ✓ | ✓ | ✓ | - |
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| Images | - | ✓ | ✓ | - |
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| File Attachments | - | ✓ | ✓ | - |
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| Session Lifecycle | - | ✓ | ✓ | - |
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| Error Events | - | ✓ | ✓ | ✓ |
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| Reasoning/Thinking | - | ✓ | - | - |
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| Command Execution | - | ✓ | - | - |
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| File Changes | - | ✓ | - | - |
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| MCP Tools | - | ✓ | - | - |
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| Streaming Deltas | ✓ | ✓ | ✓ | - |
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Agents: [Claude Code](https://docs.anthropic.com/en/docs/agents-and-tools/claude-code/overview) · [Codex](https://github.com/openai/codex) · [OpenCode](https://github.com/opencode-ai/opencode) · [Amp](https://ampcode.com)
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- ✓ = Appears in session events
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- \- = Agent supports natively, schema conversion coming soon
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- (blank) = Not supported by agent
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## Feature Descriptions
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### Text Messages
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Basic message exchange between user and assistant.
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### Tool Calls & Results
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Visibility into tool invocations (file reads, command execution, etc.) and their results. When not natively supported, tool activity is embedded in message content.
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### Questions (HITL)
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Interactive questions the agent asks the user. Emits `question.requested` and `question.resolved` events.
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### Permissions (HITL)
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Permission requests for sensitive operations. Emits `permission.requested` and `permission.resolved` events.
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### Images
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Support for image attachments in messages.
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### File Attachments
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Support for file attachments in messages.
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### Session Lifecycle
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Native `session.started` and `session.ended` events. When not supported, the daemon emits synthetic lifecycle events.
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### Error Events
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Structured error events for runtime failures.
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### Reasoning/Thinking
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Extended thinking or reasoning content with visibility controls.
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### Command Execution
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Detailed command execution events with stdout/stderr.
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### File Changes
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Structured file modification events with diffs.
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### MCP Tools
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Model Context Protocol tool support.
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### Streaming Deltas
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Native streaming of content deltas. When not supported, the daemon emits a single synthetic delta before `item.completed`.
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## Synthetic Events
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For features not natively supported, the daemon generates synthetic events to maintain a consistent event stream. Synthetic events have:
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- `source: "daemon"`
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- `synthetic: true`
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This lets you build UIs that work with any agent without special-casing each provider.
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## Request Support
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Want support for another agent? [Open an issue](https://github.com/rivet-dev/sandbox-agent/issues/new) to request it.
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