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GAP-REMOTE-007: Host Contract Layer reference

Formal HostContract interface that external systems (IDEs, CI/CD, web UIs) can program against for babysitter integration, replacing ad-hoc CLI command composition.

Pagewiki/docs/harness-features-backlog/gaps/remote-integration/GAP-REMOTE-007.mdOutgoing · 0Incoming · 1

GAP-REMOTE-007: Host Contract Layer

Field	Value
Category	remote-integration
Priority	High
Effort	L
Status	Missing

Description

Formal HostContract interface that external systems (IDEs, CI/CD, web UIs) can program against for babysitter integration, replacing ad-hoc CLI command composition.

Current State

Harness adapters compose CLI commands ad-hoc based on each harness flag mapping (HARNESS_CLI_MAP). No formal contract that a host can program against.

Target State

HostContract interface with startRun, getStatus, postEffect, subscribe methods. Implementation over existing CLI commands. Exposed via MCP server and HTTP.

Dependencies

None

Key Files

Component	Path
Harness invoker	`packages/sdk/src/harness/invoker.ts`
MCP server	`packages/sdk/src/mcp/`
Adapter registry	`packages/sdk/src/harness/registry.ts`

Recommendation

M1 (Foundation) implementation. Define HostContract interface. Implement over existing CLI. Expose via MCP and HTTP.