Run N coding agents. Each with its own goal, shape and file scope.

Graded by benchmarks they can not see: bench/hard hidden tests and the cf-build-bench gate. Written in Gleam on the BEAM.

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This site is docs and published reports only. It runs no agents and calls no models.

gleam-agents

Run N coding agents at once. Each agent has its own goal, its own shape (model, harness, tools, budget) and its own file scope. Real benchmarks grade the result. The core is Gleam on the BEAM: one process per agent, so a crash or a runaway loop stays in one place.

The problem

An eval of coding agents needs three things that most harnesses mix together:

1. Who the agent is. Model, tools, budget, harness.
2. What it may touch. Files it can write, and nothing else.
3. Who grades it. A grader the agent can not see or change.

When these are tangled, you can not tell whether a score came from the model, the harness or a leaky grader.

The promise

One plan file names N seats. Each seat is shape × goal × scope × grader. fleet runs every seat at once, writes one receipt per seat, and a separate script recomputes the score from those receipts.

How it works

plan.json ──► fleet (Gleam, one BEAM process per seat)
                │  copy seed ► workspace
                │  agent loop: model ◄► tools (list, read, write, edit, grep, run_tests, done)
                │      write/edit pass through the scope guard
                │  visible tests ► grader command (hidden tests, cf-build-bench gate, …)
                ▼
          items/<seat>.json ──► score.mjs (recompute) ──► report ──► /reports

• Shapes live in catalog/*.json. See Catalog.
• Plans live in evals/*/plan.json. See Plans.
• Scope is a list of writable paths. Reads may go anywhere inside the workspace. Writes outside the list are refused and counted. See Scope.
• Graders are shell commands. The agent never sees them. See Graders.

Quick start

git clone https://github.com/acoyfellow/gleam-agents && cd gleam-agents
export ANTHROPIC_API_KEY=…
scripts/smoke.sh evals/smoke/plan.json

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What this site is

This site is docs and published reports only. It runs no agents and calls no models. You sign in with your Cloudflare account so a report shows who published it. Nothing here bills your account.

What it does not do

• It is not a sandbox. A seat runs shell commands (tests, graders) on the machine that runs fleet. Run it where you accept that.
• One smoke run is an anecdote. The reports say how many runs they cover.
• Only the native harness exists today. Other harnesses are planned in Roadmap.