Harness layer · Open source
SuperQode
Live on Product HuntThe Harness Layer for Coding Agents
Find a coding harness, shape it to your repository, run it, and measure whether it actually did better. All from one terminal.
Keep the coding agent you already pay for. SuperQode is the layer around it.
curl -fsSL https://superqode.dev/install.sh | shPython 3.12+. uv, uvx, and other install options
Install, the Harness Hub, the A2A agent and the docs all live on superqode.dev.
Agent Card
a2a.superqode.dev
Call the A2A agentlive
Any A2A client can ask which coding agents to consider.
Discovery document
uhp.superqode.dev
Drive the UHP harnesslive
Conformant at class core, 40 of 40 checks.
What it does
The harness layer
Discover, build, run, evaluate and optimize coding-agent harnesses from one terminal.
SystemOne + Jev
Typed decisions, progressive tool discovery, and Tune from your examples.
Agent interoperability
Coding agents do not talk to each other. Yours will.
Terminal first
One terminal for the whole loop, and evidence that stays portable.
Speaks every protocol
A2A, ACP, MCP and UHP. Drive them, or be driven as one.
Own the loop
Model, harness, memory and governance stay yours.
Measure, then improve
Evaluate a harness, then optimize it against the score.
Write the decision down
Release evidence captured as Agent Quality Records.
SystemOne Harness
Smart decisions with Jev
Coding models keep writing code. SystemOne handles bounded judgments with Jev from TypeSafe AI: typed Choice, Score and Noul answers, progressive tool discovery, and Tune to improve packs from reviewed examples without changing the active harness.
Jev Integration
Connect Jev inside SystemOne. Packs, tool gates, labelled evals, and rubric grading.
Read IntegrationProgressive Tool Discovery
Catalogue → search → rank → Jev → activate. Optional schemas stay out of every prompt until selected.
Read DiscoveryGEPA Jev Optimization
SystemOne Tune improves a fixed decision pack from unlabeled or reviewed examples, then stages an experimental candidate.
Read TuneHarness Hub
The Hub
Browse native harnesses, coding agents, ACP integrations, optional routes, and maintained presets. Each entry lists runtime, setup, provenance, continuity, and safety.
105 catalog entriesLive · Unified Harness Protocol
Be driven as a harness
Published at uhp.superqode.dev and callable by any UHP client. One configured HarnessSpec on the wire, not a wrapper around someone else’s CLI.
Client and server, both ways
Drive a remote UHP harness, or serve your own so any UHP client can drive it.
Two protocol versions, one path
Serves 2026-09-12 and 2026-08-11, and answers at whichever the caller asks for.
Bring your own model key
The public bind never holds a model key. Callers send their own and pay for their own inference.
Sessions you can replay
List sessions, inspect one, and read its turn history to rebuild a transcript you did not store.
Measured with the conformance suite published alongside the specification, which is what the specification says a conformance claim means. A skip is never a pass, so a run with none is the only kind worth publishing.
Partner program
Design partners
Limited seats for teams standardising coding-agent workflows. Partners help decide what gets measured on their own repositories.
A2A Harness Fit
Harness Recommendation and Optimization
The public A2A agent shortlists from the Hub. Partners shape the bench that ranks harnesses on a given repository.
Free
Open source, now
The full terminal and the optimizers, all 105 harnesses in the Hub, and the hosted A2A agent with no key.
One off
A single engagement
Benchmark candidates on your repository. Scorecard, reproducible manifest, written recommendation.
Recurring
Ongoing
Continuous spend measurement, re-runs when a model or spec changes, in our cloud or self-hosted in yours.
The free tier is available now. The other two are shaped with partners. Full details on superqode.dev
The harness layer
Build your own harnesses or connect open-source and proprietary agents, then evaluate, govern, and improve how they work across your repositories.
Open source · Terminal first · Any agent or model · Local or cloud
Design partnersFAQ
Questions
What SuperQode is, which agents it connects, and how to install.
SuperQode is built and maintained by Superagentic AI. We also work with teams directly on agent experience, engineering, optimization and delivery. See how we work with teams.