What is add-to-project?

A project-update workflow for an existing Better Fullstack project, identified by a bts.jsonc file. It plans changes to the project’s capabilities, services, deployment targets, and generated files before applying them.

Use it to add capabilities such as CI, documentation, email, search, storage, rate limiting, or mobile support. It also helps plan riskier changes to databases, authentication, APIs, payments, or other stack parts.

It reduces the risk of changing generated project files by hand or choosing incompatible updates. A preview shows blockers, file and dependency changes, environment changes, and compatibility adjustments first.

add-to-project — Skill for Claude Code by Marve10s/Better-Fullstack

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add Marve10s/Better-Fullstack --skill add-to-project

Clone the repo

git clone --depth 1 https://github.com/Marve10s/Better-Fullstack

Made for: Claude Code.

Or install better-fullstack, the plugin that ships this one along with the rest of its 2 skills.

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/skills/marve10s/better-fullstack/add-to-project/github.svg)](https://agentmods.dev/skills/marve10s/better-fullstack/add-to-project)

Your own site

<a href="https://agentmods.dev/skills/marve10s/better-fullstack/add-to-project"><img src="https://agentmods.dev/badge/skills/marve10s/better-fullstack/add-to-project/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/skills/marve10s/better-fullstack/add-to-project"><img src="https://agentmods.dev/badge/skills/marve10s/better-fullstack/add-to-project.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 71 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 451 The whole file, excluding the scripts and references it only reads on demand.

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

NVIDIA SkillSpector warn 7 Sept 2026

SkillSpector: 1 finding, up to medium

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

medium MCP Rug Pull · line 40
npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.

Fix: Pin the version: npx @scope/[email protected]

How audits are shown

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	$0.00071	$0.00451
Opus 5.5	$0.00028	$0.00180
Sonnet 5.5	$0.00014	$0.00090
Haiku 4.5	$0.00007	$0.00045

Measured 1mo ago against content hash 8dda945ce63b, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

add-to-project 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 1mo 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.

plugin/skills/add-to-project/SKILL.md · 43 lines

What it actually says

Add to an Existing Better Fullstack Project

Use the Better Fullstack MCP server for existing-project updates. Do not hand-edit generated stack metadata or guess which template files belong to a capability.

Workflow

Confirm the project directory and ensure it contains bts.jsonc.
Call bfs_get_guidance and bfs_get_schema.
For capability changes, call bfs_plan_stack_update with the target projectDir and requested stack fields.
Review the preview, including blockers, file changes, dependency changes, env changes, and compatibility adjustments.
Call bfs_apply_stack_update only when the plan is acceptable.
For legacy addon/deploy-only changes, call bfs_plan_addition before bfs_add_feature.
Report changed files and the exact install/test commands.

Rules

Keep update semantics preview-first.
Prefer additive updates first: generated CI, docs, observability, email, search, vector DB, file storage, rate limiting, and mobile capabilities.
Treat database, ORM, auth, API, and payment-provider swaps as risky and make compatibility changes explicit.
Set installs disabled unless the user asks for dependency installation.
Do not start a dev server.

CLI-only fallback

If the Better Fullstack MCP tools are unavailable, inspect the current flags with npx -y create-better-fullstack@latest add --help, then run the explicit add command with --project-dir <path> --dry-run --no-install. Review that preview before rerunning without --dry-run. Do not guess option names or hand-edit generated stack metadata.

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.

1mo ago Changed · +7 lines 8dda945ce63b
1mo ago First seen · 36 lines · 71 tokens per session scan A 4ee12c69b53b

Subscribe to this mod's changes

add-to-project is a skill published in the GitHub repository Marve10s/Better-Fullstack (806 stars, last pushed today), licensed MIT. It adds 71 tokens to every session and 451 once invoked, about $0.0003 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.

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add-to-project