Report · marked 26 Aug 2026
calcom/cal.diy
Solid foundations, held back in a few specific places.
TypeScript · 47,926 stars · 7,702 files · branch main
80
/100
A-
Instructions
27/27Whether the repo tells an agent how to behave before it starts guessing. Full marks.Setup
18/20Whether an agent can install the project and get it running without a human. Losing marks on pinned runtime version.Verification loop
20/25Whether an agent can check its own work. This is the category that most decides whether agent output is trustworthy. Losing marks on tests exist and static type checking.Context economy
9/20Whether 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
01
File sizes fit in context
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.
02
Repository weight
Large binaries and vendored trees slow every operation an agent performs. Git LFS or a separate assets repo keeps the working tree navigable.
03
Static type checking
A type checker gives an agent an error message instead of a runtime surprise. It's the second-fastest feedback loop after the compiler.
The full marking
Every deduction below names the file or setting it came from.
Instructions 27/27 A+
Whether the repo tells an agent how to behave before it starts guessing.
✓Agent instruction file
12/12
AGENTS.md is present, which is the format the most tools read.
Also found: CLAUDE.md
✓Instruction quality
12/12
Specific enough that an agent can act on it.
9,222 characters, a workable length
names the actual commands to run
uses headings, so an agent can skim it
includes copyable code blocks
✓README as an entry point
3/3
README has a clear getting-started section.
Setup 18/20 A
Whether an agent can install the project and get it running without a human.
✓Deterministic install
6/6
yarn.lock pins the dependency tree.
Found yarn.lock
✓Discoverable commands
6/6
Commands are declared where an agent will look for them.
package.json scripts (app-store-cli, app-store:build, app-store:watch, app-store, create-app, edit-app…)
scripts/ directory
✓Environment config
4/4
.env.example documents what the app needs to run.
✗Pinned runtime version
0/2
No pinned runtime version.
Add a .nvmrc, .python-version, or equivalent so the agent's toolchain matches yours.
✓Reproducible environment
2/2
dockerfile gives a known-good environment.
Verification loop 20/25 A-
Whether an agent can check its own work. This is the category that most decides whether agent output is trustworthy.
✗Tests exist
6/8
576 test files against 5067 source files.
e.g. __checks__/csp-login.spec.ts, apps/api/v2/src/app.e2e-spec.ts, apps/api/v2/src/lib/inputs/capitalize-timezone.spec.ts
✓Test command is discoverable
7/7
An agent can find and run `npm run test`.
✓Continuous integration
4/4
50 GitHub Actions workflows define what "passing" means.
✓Lint and format rules
3/3
biome.json encodes the house style.
✗Static type checking
0/3
No static type checking.
A type checker gives an agent an error message instead of a runtime surprise. It's the second-fastest feedback loop after the compiler.
Context economy 9/20 C
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 70 patterns.
✗File sizes fit in context
0/6
6 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.
.yarn/releases/yarn-4.12.0.cjs — 2923KB
packages/features/bookings/lib/handleNewBooking/test/reschedule.test.ts — 124KB
apps/api/v2/src/platform/event-types/event-types_2024_06_14/controllers/event-types.controller.e2e-spec.ts — 123KB
✗Repository weight
0/5
About 1147MB checked out. Large enough that cloning and searching are both slow.
Large binaries and vendored trees slow every operation an agent performs. Git LFS or a separate assets repo keeps the working tree navigable.
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 Scheduling infrastructure for absolutely everyone. ## Setup ``` yarn install ``` ## Commands ``` yarn dev # run locally yarn start # run the app yarn build # produce a build yarn test # run the test suite, must pass before any commit yarn lint # lint yarn format # format yarn app-store-cli yarn app-store:build ``` ## Layout - `packages/` 3404 source files - `apps/` 1624 source files - `scripts/` 20 source files - `example-apps/` 7 source files - `__checks__/` 3 source files - `deploy/` 2 source files ## Conventions - Tests live alongside the code they cover, following `__checks__/csp-login.spec.ts`. - CI defines what passing means. See `.github/workflows/all-checks.yml`, and keep it green. - TODO: add the two or three conventions a newcomer always gets wrong here. ## Gotchas - `.yarn/releases/yarn-4.12.0.cjs` is 2923KB. It will not fit comfortably in context, so read it in parts. - Copy `.env.example` before running anything that needs configuration. --- 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/calcom/cal.diy.md
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