Ducklab MCP Server
A self-hosted harness that runs a project's full development cycle with several LLMs in fixed roles, under test gates that only you sign.
People who work with agentic workflow, code generation and developer tools and want it reachable from Claude, Cursor, VS Code, or another MCP client. The project is written in Go.
VERIFIED ACTIVE
LAST COMMIT 2026-09-15 · ★ 9 · #138 OF 168 MAINTAINED DEVELOPER TOOLS · VERIFIED 2026-09-18
Apache-2.0 · Go servers · how we verify → /methodology
01 · Install Ducklab
Claude Desktop
Settings → Extensions → Install, then select the https://github.com/jrullan/ducklab/releases/download/v0.7.0/ducklab-mcp.mcpb .mcpb bundle02 · Evidence
Security posture
What to check before giving this server access to your agent - from the registry, GitHub, and our own probes. We don't score safety; we show what's verifiable.
runs as Claude Desktop extension (.mcpb bundle)
repo age created 2026-07-22 - young repo, little track record yet
license Apache-2.0 - declared in the repository
registry namespace io.github.jrullan is GitHub-verified and matches the repo owner
03 · What Ducklab can do
Prose above is summarized from the project's README and registry record - no invented capabilities.
Latest releases
v0.9.5 · 2026-09-09
v0.9.5 · Artifact and task workflow · Versioned artifacts now follow one consistent grammar, and plans are checked against that grammar before graph validation. This makes malformed or outdated artifact structures…
v0.9.4 · 2026-09-08
v0.9.4 · Planning and documents · Plan reviews now verify that every task is executable, atomic, traceable to a specification, and consistent with ownership and dependency rules before approval. · Plan diagnostics now…
v0.9.3 · 2026-08-29
v0.9.3 · Escalation cards · "Open task body" on an escalation card used to be a dead end. It now actually opens the task, where you can edit the body, relaunch it, or split it. · When the engine stumbles · The engine…
04 · Who maintains Ducklab
ducklab is maintained by jrullan. It's the only MCP server we track from this author; the repo dates to Jul 2026.
05 · Facts
- repository
- github.com/jrullan/ducklab
- category
- developer tools - ranked #138 of 168 actively-maintained developer tools servers as of 2026-09-18.
- release cadence
- 10+ releases in the last 90 days (latest 2026-09-09)
- registry
- io.github.jrullan/ducklab (active, first published 2026-08-23)
- packages
- mcpb:https://github.com/jrullan/ducklab/releases/download/v0.7.0/ducklab-mcp.mcpb
06 · Ducklab FAQ
What is Ducklab?
A self-hosted harness that runs a project's full development cycle with several LLMs in fixed roles, under test gates that only you sign.
Is Ducklab still maintained?
Yes - as of 2026-09-18, its last commit was 2026-09-15 and it shipped 10+ releases in the last 90 days. We re-verify nightly.
07 · Alternatives to Ducklab
Alternatives to Ducklab
Maintained developer tools servers if Ducklab isn't the fit.
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- Kubefwd Kubernetes port forwarding for local development with automatic /etc/hosts entries. ★ 4,171 · 2026-09-15
- Sem Entity-level code intelligence: semantic diff, impact analysis, blame, and context for AI agents ★ 3,352 · 2026-09-13
- Claude Code Explorer MCP Explore the Claude Code CLI source - browse tools, commands, search code, and more. ★ 3,342 · 2026-08-29
- Server for WinDbg Crash Analysis A Model Context Protocol server for Windows crash dump analysis using WinDbg/CDB ★ 1,578 · 2026-09-09
Pairs well with
Servers that cover what Ducklab doesn't - only shown when the pairing reason fits the companion.
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