Report · marked 25 Aug 2026

syncthing/syncthing

An agent can work here, but it will waste turns finding its footing.

Go · 87,989 stars · 942 files · branch main

59 /100 B-

Instructions 3/27Whether the repo tells an agent how to behave before it starts guessing. Losing marks on agent instruction file and instruction quality.Setup 10/20Whether an agent can install the project and get it running without a human. Losing marks on discoverable commands and environment config.Verification loop 22/22Whether an agent can check its own work. This is the category that most decides whether agent output is trustworthy. Full marks.Context economy 15/20Whether the repo fits in a context window, or fights it. Losing marks on file sizes fit in context and repository weight.Navigability 8/10How quickly anything new can orient itself. Losing marks on written documentation.

Higher is better. Accent marks what is costing you most.

Fix these first

Agent instruction file

Add an AGENTS.md at the root: what the project is, how to install, how to run, how to test, and the two or three conventions a newcomer always gets wrong.

Instruction quality

Instructions earn their keep by naming exact commands. 'Run the tests with `pnpm test`' beats three paragraphs of philosophy.

Discoverable commands

Declare the handful of commands that matter in package.json scripts, a Makefile, or a justfile. Naming them turns guesswork into a lookup.

The full marking

Every deduction below names the file or setting it came from.

Instructions 3/27 F

Whether the repo tells an agent how to behave before it starts guessing.

✗Agent instruction file 0/12

None found. Every agent that opens this repo starts from zero.

Add an AGENTS.md at the root: what the project is, how to install, how to run, how to test, and the two or three conventions a newcomer always gets wrong.

Looked for AGENTS.md, CLAUDE.md, .github/copilot-instructions.md, .cursorrules

✗Instruction quality 0/12

Nothing to judge, since there are no instructions.

Instructions earn their keep by naming exact commands. 'Run the tests with `pnpm test`' beats three paragraphs of philosophy.

✓README as an entry point 3/3

README has a clear getting-started section.

Setup 10/20 C+

Whether an agent can install the project and get it running without a human.

✓Deterministic install 6/6

go.sum pins the dependency tree.

Found go.sum

✗Discoverable commands 0/6

No declared commands. An agent has to infer how to build and run this from the file tree.

Declare the handful of commands that matter in package.json scripts, a Makefile, or a justfile. Naming them turns guesswork into a lookup.

✗Environment config 0/4

Nothing documents the environment this needs. An agent will get a runtime error it can't diagnose.

Add a .env.example listing every variable with a safe placeholder value. It's the cheapest possible fix and it unblocks the whole first run.

✓Pinned runtime version 2/2

The language runtime version is pinned.

go.mod declares a Go version

✓Reproducible environment 2/2

dockerfile gives a known-good environment.

Verification loop 22/22 A+

Whether an agent can check its own work. This is the category that most decides whether agent output is trustworthy.

✓Tests exist 8/8

166 test files against 576 source files.

e.g. cmd/infra/stcrashreceiver/sentry_test.go, cmd/infra/strelaypoolsrv/main_test.go, cmd/infra/strelaypoolsrv/stats_test.go

✓Test command is discoverable 7/7

An agent can find and run `go test ./...`.

✓Continuous integration 4/4

8 GitHub Actions workflows define what "passing" means.

✓Lint and format rules 3/3

.golangci.yml encodes the house style.

–Static type checking n/a

Not applicable — the Go compiler type checks every build.

Context economy 15/20 B+

Whether the repo fits in a context window, or fights it.

✓No committed build output 6/6

No generated directories committed.

✓.gitignore hygiene 3/3

.gitignore covers 20 patterns.

✗File sizes fit in context 2/6

4 source files are over 100KB.

A single file that fills the context window forces an agent to work from fragments, and it will confidently edit code it never saw. Splitting the worst offenders pays for itself immediately.

gui/default/syncthing/core/syncthingController.js — 152KB

lib/model/mocks/model.go — 115KB

lib/model/model_test.go — 110KB

✗Repository weight 4/5

About 127.7MB checked out, which is comfortable.

Here is your AGENTS.md

Drafted from what is actually in this repository: the install command from your lockfile, the commands you already declare, your real directory layout. Anything marked TODO needs a person. Save it at the root as AGENTS.md.

AGENTS.md — drafted for syncthing/syncthing

# AGENTS.md

Open Source Continuous File Synchronization

## Setup

```
go mod download
```

## Commands

```
go test ./...   # run the test suite
```

## Layout

- `lib/`      378 source files
- `cmd/`      71 source files
- `internal/` 64 source files
- `gui/`      26 source files
- `test/`     19 source files
- `script/`   12 source files

## Conventions

- Tests live alongside the code they cover, following `cmd/infra/stcrashreceiver/sentry_test.go`.
- CI defines what passing means. See `.github/workflows/build-infra-dockers.yaml`, and keep it green.
- TODO: add the two or three conventions a newcomer always gets wrong here.

## Gotchas

- `gui/default/syncthing/core/syncthingController.js` is 152KB. It will not fit comfortably in context, so read it in parts.

---

Drafted by agentreadme.com from what is in this repository. Everything marked TODO
needs a human. Check it in as AGENTS.md at the root.

Open the raw markdown or curl -o AGENTS.md agentreadme.com/draft/syncthing/syncthing.md

Show the mark

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[![agent ready](https://agentreadme.com/badge/syncthing/syncthing.svg)](https://agentreadme.com/syncthing/syncthing)

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Think this mark is wrong?

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