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.
npx agentmods add commands/thedecipherist/claude-code-mastery-project-starter-kit/add-featuregit clone --depth 1 https://github.com/TheDecipherist/claude-code-mastery-project-starter-kitWrote 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.
[](https://agentmods.dev/commands/thedecipherist/claude-code-mastery-project-starter-kit/add-feature)<a href="https://agentmods.dev/commands/thedecipherist/claude-code-mastery-project-starter-kit/add-feature"><img src="https://agentmods.dev/badge/commands/thedecipherist/claude-code-mastery-project-starter-kit/add-feature.svg" alt="Measured on agentmods" height="20"></a>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 | $0.00017 | $0.03243 |
| Opus 5 | $0.00009 | $0.01622 |
| Sonnet 5 | $0.00003 | $0.00649 |
| Haiku 4.5 | $0.00002 | $0.00324 |
Grade A, and why
add-feature 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 5d 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.
How it starts
The opening of the file, as written. The whole thing — 350 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Add Feature to Existing Project
Add capabilities (MongoDB, Docker, testing, etc.) to an existing starter-kit project after scaffolding. Idempotent — safely updates already-installed features to the latest version.
Arguments: $ARGUMENTS
Feature Definitions
The authoritative table of features that can be added to projects. Both /add-feature and /update-project reference these definitions.
| Feature | Files (from $SOURCE) | Deps | DevDeps | Env Vars | Scripts | CLAUDE.md Rule |
|---|---|---|---|---|---|---|
mongo |
scripts/db-query.ts, scripts/queries/example-find-user.ts, scripts/queries/example-count-docs.ts |
strictdb@^0.1.0, mongodb@^6.5.0 |
tsx@^4.7.0 |
STRICTDB_URI |
db:query, db:query:list |
Rule 3 |
postgres |
scripts/db-query.ts, scripts/queries/example-find-user.ts, scripts/queries/example-count-docs.ts |
strictdb@^0.1.0, pg@^8.0.0 |
tsx@^4.7.0 |
STRICTDB_URI |
db:query, db:query:list |
Rule 3 |
docker |
Generated from templates (Dockerfile, docker-compose.yml) | — | — | — | — | Rule 10 |
vitest |
vitest.config.ts |
— | vitest@^2.0.0 |
— | test:unit, test:unit:watch, test:coverage |
— |
playwright |
playwright.config.ts |
— | @playwright/test@^1.42.0 |
— | test:e2e, test:e2e:ui, test:e2e:headed, test:e2e:chromium, test:e2e:report, test:kill-ports |
Rule 4 |
content |
scripts/build-content.ts, scripts/content.config.json |
— | — | — | content:build, content:build:id, content:list |
— |
Step 0 — Resolve Source (Starter Kit)
Find the starter kit source directory:
- If CWD has BOTH
claude-mastery-project.confAND.claude/commands/new-project.md→ use CWD as$SOURCE - Else read
~/.claude/starter-kit-source-path→ verify it still has both files - Else ask via AskUserQuestion: "Where is the starter kit cloned?" with a text input
Store as $SOURCE.
Step 1 — Parse Arguments
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.
- 5d ago First seen · 350 lines · 17 tokens per session scan A f78667343b51
add-feature is a command published in the GitHub repository TheDecipherist/claude-code-mastery-project-starter-kit (337 stars, last pushed 2mo ago), licensed MIT. It adds 17 tokens to every session and 3,243 once invoked, about $0.0001 per session on Opus 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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