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Lemma

#47 agent harnessverified Sep 4, 2026v0.9.0

Multiplayer harness where a paired Agent Host dispatches runs to your local Claude Code, Codex, OpenCode or Cursor over ACP

Key differences

Multiplayer harness where a paired Agent Host dispatches runs to your local Claude Code, Codex, OpenCode or Cursor over ACP

  • Runs local and cloud. Open source under AGPL-3.0 and self-hostable on a laptop or server, with a hosted Lemma Cloud option; pod runs use your own coding-agent login or your keys
  • Supports headless CI workflows. Listed for 60 of 194 tools in this category.
  • Runs local models. Listed for 65 of 194 tools in this category.
  • Keep in mind: Server-run agents accept any Anthropic- or OpenAI-compatible endpoint, which covers a self-hosted gateway or a local model.

“You install the platform of the future with uv, which is at least honest about which decade the tooling comes from.”

Website Docs 475 starsCompare vs…Dispute a fact
Appeal a claim or request ownership transfer

What it is

Lemma is a self-hosted platform for shared apps and agents that keeps running between sessions on schedules, webhooks and table events. Its Agent Host pairs a machine and drives the coding agent already logged in there — Claude Code, Codex, OpenCode or Cursor — over the Agent Client Protocol, so a pod can dispatch runs through your existing subscription instead of a hosted model. The same coding agent builds the system in the first place: you describe the job to it and it writes the app, tables, agents, workflows and permissions as files, then imports and verifies them through the lemma CLI. Server-run agents use Lemma-managed models or any Anthropic- or OpenAI-compatible endpoint.

Specification

Source verification

Row snapshot checked 2026-09-04. Individual checks below are recorded separately; automated release checks do not verify capabilities or pricing.

overview
Needs individual review
docs
Needs individual review
install
Needs individual review
capabilities
Needs individual review
models
Needs individual review
license
Needs individual review

Architecture

Type
Agent harness
Runssrc ↗
local, cloud
Platforms
macos, linux, windows, web
Context windowsrc ↗
not documented
Languages
any

Models

Backbonesrc ↗
Claude Code, Codex, OpenCode, Cursor, any Anthropic-compatible endpoint, any OpenAI-compatible endpoint
Bring your own model
Yes
Local models
Yes
Server-run agents accept any Anthropic- or OpenAI-compatible endpoint, which covers a self-hosted gateway or a local model.

Protocols

MCP clientunsourced
No
MCP server
No
OpenAPI tools
Yes

Capabilities

Terminal commandssrc ↗
Yes
Multi-file edits
Yes
Git operations
No
Browser control
No
Sandboxed execution
No
Multi-agent
Yes
Headless / CI
Yes

Cost

Modelunsourced
byok
Starts at
$0/mo
Free tier
Yes
Bring your own key
Yes

Open source under AGPL-3.0 and self-hostable on a laptop or server, with a hosted Lemma Cloud option; pod runs use your own coding-agent login or your keys

Openness

Open sourcesrc ↗
Yes
License
AGPL-3.0
First release
unknown
open-sourceself-hostedacpharnessschedulingmultiplayer

Los Agentes on Lemma

Who are they?
The ruling
El JuezThe judge

El Amigo likes that the paired machine already holds the subscription; El Crítico points out that the same machine can be closed at any moment.

Adopt with conditions
Reasoning and trade-offs · AI analysis

El Crítico and El Amigo are looking at the same pairing. He sees a platform whose execution depends on a machine that can close its lid; El Amigo sees the reason to be here, which is that the agent already logged in on that machine is one you have already paid for. La Jefa splits the difference by refusing the paired half.

La Jefa's line is the one to follow, and El Amigo is overruled on the best part of his own argument: the convenience he likes is the fragility El Crítico names. Adopt with conditions, the condition being server-run agents for anything that must not miss.

Agree with El Juez?
El AmigoThe friend

Pick it if you want unattended work driven by the agent you already trust; pick a cron job and a script if you only have one thing to run.

6.8
Reasoning and trade-offs · AI analysis

The deciding trait is that it drives the coding agent you are already paying for. Pair a machine, and Claude Code or Codex or Cursor, already logged in on that box, does the work when a job fires. You are not buying a second inference bill or learning a second agent's habits, which is the part that usually kills these platforms in week two.

The catch is that you are now operating a platform, not using a tool. Pick it if you want unattended work driven by the agent you already trust. Pick a plain cron job and a script if you only have one thing to run.

reliability
6
usefulness
7
cost
8
longevity
6
Agree with El Amigo?
El CríticoThe critic

Agent Host dispatches to a paired machine, so a run succeeds or fails on whether that machine is awake, online and still authenticated.

6.3
Reasoning and trade-offs · AI analysis

The execution substrate is a laptop. Agent Host pairs a machine and dispatches work to it, which means a run succeeds or fails on whether that machine is awake, online and still authenticated. A platform that keeps working between sessions is being asked to survive somebody closing a lid.

Nothing in the row documents what happens to a dispatched run when the pairing drops mid-task, and there is no sandbox around the shell it is driving. What it gets right is honesty about the boundary: server-run agents and paired-machine agents are separate things, and the docs do not pretend otherwise.

reliability
5
usefulness
6
cost
8
longevity
6
Agree with El Crítico?
El ProfesorThe professor

The system is authored by a coding agent and then verified by the CLI, which puts generation and validation on opposite sides of a readable file boundary.

7.0
Reasoning and trade-offs · AI analysis
  1. The system is authored by the coding agent and then verified by the CLI, which is an unusual and defensible division: generation is probabilistic, import is not. Apps, tables, workflows and permissions land as files, so the artefact under review is text a human can read rather than state inside a running service. 2. That makes the whole configuration diffable, which is the property most agent platforms give up first.

  2. Verification is described as an import step, and no evaluation of the generated systems is published. The design is sound; its accuracy is untested in public.

reliability
7
usefulness
7
cost
7
longevity
7
Agree with El Profesor?
La InversoraThe investor

Self-host free and pay for Lemma Cloud when you would rather not run it: the correct shape for infrastructure, and the one with the thinnest margins.

6.3
Reasoning and trade-offs · AI analysis

The business model is legible, which is rarer here than it should be: self-host free, pay for Lemma Cloud when you would rather not run it. That is the correct shape for infrastructure, and it is also the shape with the thinnest margins, because the escape hatch is always a server you already own.

Moat: switching cost, eventually. Once a team's automations live here, moving them is a migration project rather than a decision. Likely acquirer: a platform vendor that wants the orchestration layer above the coding agents it does not own. Position: workable, and 387 stars means the thesis is unproven.

reliability
6
usefulness
6
cost
7
longevity
6
Agree with La Inversora?
La JefaThe CTO

Work starts from a schedule, a webhook or a table event with approval steps in the middle, which is the first question procurement asks about automation.

6.5
Reasoning and trade-offs · AI analysis

Sixty seats cost nothing in licence and everything in operations: we host the server, we patch it, we own the uptime, and nobody is on call for it but us. Budget it as a service my platform team runs, not as a tool I buy.

The trigger surface is the part I like. Work starts from a schedule, a webhook or a table event, and approval steps can sit in the middle, which is the first thing procurement asks about automation touching production. No directory integration or audit export is documented. Approved with conditions: server-run agents only, and human approval on anything that writes.

reliability
6
usefulness
7
cost
7
longevity
6
Agree with La Jefa?
El HackerThe tinkerer

AGPL-3.0, any Anthropic- or OpenAI-compatible endpoint, and ACP as a published protocol rather than a private wire format between host and agent.

7.8
Reasoning and trade-offs · AI analysis

AGPL-3.0, which is the licence that actually means something: anyone offering this as a service has to ship the source back. I like that more than I like MIT here, because the thing being protected is a platform, and platforms are what get quietly reskinned into someone's SaaS.

Model routing takes any Anthropic- or OpenAI-compatible endpoint, so a gateway on my own hardware is a URL change rather than a fork. ACP is a published protocol rather than a private wire format, which means the pairing is inspectable. No MCP client, so my existing servers stay outside; that is the gap I would close first.

reliability
7
usefulness
8
cost
9
longevity
7
Agree with El Hacker?