What is lastsaas CLAUDE.md?

Project instructions for developing LastSaaS, including validation, logging, build checks, and deployment rules for projects based on it. MongoDB is the database system used for its data schemas.

Use them when changing models, database collections, system logging, backend or frontend code, or any project built from the LastSaaS boilerplate.

They keep validation rules in the Go code and MongoDB synchronized, while making required checks and dependent-project deployments explicit.

How jonradoff/lastsaas configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to jonradoff/lastsaas. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/jonradoff/lastsaas/master/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/jonradoff/lastsaas

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/jonradoff/lastsaas/claude-md/github.svg)](https://agentmods.dev/instructions/jonradoff/lastsaas/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/jonradoff/lastsaas/claude-md"><img src="https://agentmods.dev/badge/instructions/jonradoff/lastsaas/claude-md/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/jonradoff/lastsaas/claude-md"><img src="https://agentmods.dev/badge/instructions/jonradoff/lastsaas/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 556 This file is loaded in full into every session.

When invoked 556 The same file — it is already loaded in full.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00556	$0.00556
Opus 5.5	$0.00222	$0.00222
Sonnet 5.5	$0.00111	$0.00111
Haiku 4.5	$0.00056	$0.00056

Measured 2mo ago against content hash b947a7b5e5e4, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

lastsaas CLAUDE.md scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

CLAUDE.md · 45 lines

How it starts

The opening of the file, as written. The whole thing — 45 lines — stays where its author put it; the contents beside it link to each section on GitHub.

LastSaaS Development Rules

Validation

LastSaaS uses hybrid validation: Go-side (validate struct tags via go-playground/validator) and MongoDB JSON Schema (internal/db/schema.go).

When modifying model structs in internal/models/:

Update validate struct tags on the model
Update the corresponding MongoDB JSON Schema in internal/db/schema.go
Keep both in sync — the Go tags and MongoDB schema must enforce the same constraints
Run cd backend && go test ./internal/validation/... to verify

When adding a new collection that accepts user/API writes:

Add validate tags to the model struct
Add a schema function to internal/db/schema.go and include it in AllSchemas()
Add tests in internal/validation/validate_test.go

System Logging

Use syslog.Logger for all significant system events. Severity levels: critical, high, medium, low, debug.

Build Verification

Always verify after changes:

cd backend && go build ./...
cd frontend && npx tsc --noEmit

Dependent Project Deployment (CRITICAL)

Any project built on the LastSaaS boilerplate — whether using it as a Git submodule, fork, or copy — MUST deploy using the SaaS Dockerfile (Dockerfile.saas) and the corresponding Fly config (fly.saas.toml). Never use bare fly deploy on a project that depends on LastSaaS.

Why this matters: The SaaS Dockerfile runs both the product backend AND the LastSaaS backend behind Caddy (via supervisord). The LastSaaS backend serves all auth endpoints (/api/auth/*), bootstrap status (/api/bootstrap/status), OAuth providers (Google, etc.), billing, and admin APIs. Without it, login breaks silently — the product backend has no auth routes, so API calls return HTML from the SPA catch-all, causing mysterious redirects to /setup or broken login forms with missing OAuth buttons.

Correct deploy command:

fly deploy -c fly.saas.toml

Propagation rule: When setting up or working on any dependent project, ensure:

The project has a deploy.md at its root with full deployment instructions and the "why" behind the multi-process architecture
The project's Claude Code memory (MEMORY.md or CLAUDE.md) contains a cross-reference: "See deploy.md — never bare fly deploy"
If the project doesn't have these yet, create them before the first deployment

Read the full file on GitHub · 45 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

2mo ago First seen · 45 lines · 556 tokens per session scan A b947a7b5e5e4

Subscribe to this mod's changes

lastsaas CLAUDE.md is an instructions file published in the GitHub repository jonradoff/lastsaas (175 stars, last pushed 8mo ago), licensed MIT. It adds 556 tokens to every session, about $0.0022 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

ai-agents go mcp-server saas-boilerplate

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lastsaas: Instructions file for Claude Code