Agent field guideCoding harness

OpenCode

ship

anomalyco · beta · osi-open-source

Open-source coding harness with TUI, headless serve, and an OpenAPI control surface.

Visit opencode.ai →Open in Noemium Catalog cardSource verified 2026-08-26

ledger entry · observed by @whysanesanders

Full agent loop in the repo. Still rough on large refactors and can hallucinate library APIs.

layer

Coding harness

maturity

beta

deployment

local

evidence

Source verified

Install

command · npm

npm i -g opencode

official install source →

Best for

Bounded coding jobs with existing test coverage
A terminal agent when you do not want a full AI IDE

Requirements

Node.js
A repository with a working test command if you want the loop to close

Real cost scenarios

Open-source harness

$0/mo

Binary is free; you pay the model.

Paid OpenCode plan

$20/mo

Vendor paid plan from $20/mo as listed on the site.

Models and providers

BYOK / configured model

Channels and surfaces

interactive TUIheadless serve

Security boundary

high privilege

Local process with shell and file access. Model traffic goes to whatever provider you configure.

Treat headless serve as an open control plane.
Do not YOLO-approve on untrusted trees.

Known limitations

Agent loops can wander on ambiguous requirements.
Less mature editor integration than Cursor or Windsurf.

Typed evidence

¹Availabilitygithub.com/anomalyco/opencodechecked 2026-08-26
²Installgithub.com/anomalyco/opencodechecked 2026-08-26
³Requirementsgithub.com/anomalyco/opencodechecked 2026-08-26
⁴Pricinggithub.com/anomalyco/opencodechecked 2026-08-26
⁵Security / threat modelgithub.com/anomalyco/opencodechecked 2026-08-26
⁶Licensegithub.com/anomalyco/opencodechecked 2026-08-26

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