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hostproto-dap-delve

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hostproto-dap-delve

The second HostProto DAP adapter: a Delve (dlv dap, Go) session exposed through MCP 2026-07-28, pinned to the same eleven hostproto-semantics bundles as hostproto-dap-debugpy and hostproto-mcp-playwright. It exists to test kill gate 1 late: does a second, unrelated debugger need a different envelope? It did not. The diff against the debugpy adapter was the measurement (docs/DECISIONS.md ADR-0001), and that diff is now src/binding.ts: since hostproto-semantics ADR-0012 both adapters are bindings on hostproto-dap-core.

What differs from debugpy, and where it went

Delve fact

Where it landed

dlv dap listens on TCP; the client connects

the core's DapClient.connect(); start() in the binding

launch builds the program (mode: debug), in the adapter's cwd

context_create takes cwd = module dir; a build error is host_failed, not a hang

debuggee stdio rides dlv's own stdio, not DAP output events

normalized into the same output events, channel: adapter-stdio; observe.output is provider: host, semantics: normalized in the profile

goroutines are threads; pause stops a runtime goroutine with allThreadsStopped

every surface is stamped with the event's reason and the thread that caused it

setBreakpoints says verified: false with a message for an unbindable line

the spike's "verified only the bound one" case is reachable here (debugpy relocates instead)

no reverse requests

act.host_request.resolve and observe.host_requests are unsupported in the profile

setVariable — acknowledged, read back, and honoured by the debuggee

verified is earned by an independent read in both adapters (added here; see ADR-0003 for the retracted claim that motivated it)

Everything else — handles, revision per thread, host-assigned cursor, revision-scoped targets refused before send, preconditions, receipts with unknown, omitted-not-lost, recovery with the DAP log as evidence, the earned capability profile — is the debugpy adapter's code, unchanged.

Related MCP server: DebugPilot

Run

npm ci
go install github.com/go-delve/delve/cmd/dlv@v1.27.1   # or HOSTPROTO_DLV=/path/to/dlv
npm test          # real client ↔ real server over stdio ↔ real dlv dap ↔ real Go program
npm start

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