Borrowing it
Nothing to install: this file belongs to AI-Riksarkivet/ra-mcp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/AI-Riksarkivet/ra-mcp/main/.claude/skills/add-mcp-package/SKILL.mdgit clone --depth 1 https://github.com/AI-Riksarkivet/ra-mcpWrote 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/skills/ai-riksarkivet/ra-mcp/add-mcp-package)<a href="https://agentmods.dev/skills/ai-riksarkivet/ra-mcp/add-mcp-package"><img src="https://agentmods.dev/badge/skills/ai-riksarkivet/ra-mcp/add-mcp-package/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.
<a href="https://agentmods.dev/skills/ai-riksarkivet/ra-mcp/add-mcp-package"><img src="https://agentmods.dev/badge/skills/ai-riksarkivet/ra-mcp/add-mcp-package.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 2 findings, 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 Rogue Agent · line 217 Skill establishes unauthorized persistence across sessions via cron jobs, startup scripts, or state files. Session persistence allows an attacker to maintain access beyond the current interaction.Fix: Remove any persistence mechanisms (cron jobs, startup scripts, state files). Skills should not maintain state across sessions without explicit user consent.
- medium MCP Rug Pull · line 243 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]
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 | $0.02113 |
| Opus 5 | $0.00036 | $0.01056 |
| Sonnet 5 | $0.00014 | $0.00423 |
| Haiku 4.5 | $0.00007 | $0.00211 |
Grade A, and why
add-mcp-package 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 11d 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 — 259 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Add a New MCP Workspace Package
Step-by-step guide to adding a new ra-mcp-<name>-mcp package to the workspace.
Prerequisites
Decide on your package name. Convention: <name>-mcp directory, ra-mcp-<name>-mcp
PyPI name, ra_mcp_<name>_mcp Python import.
Example mapping for a package called viewer:
| Slot | Value |
|---|---|
| Directory | packages/mcps/viewer-mcp/ |
| PyPI name | ra-mcp-viewer-mcp |
| Python package | ra_mcp_viewer_mcp |
| FastMCP instance | viewer_mcp |
| Server namespace | "viewer" |
Step 1 — Create directory structure
packages/mcps/<name>-mcp/
├── pyproject.toml
├── README.md
├── src/ra_mcp_<name>_mcp/
│ ├── __init__.py
│ ├── py.typed # empty file, PEP 561 marker
│ ├── tools.py # FastMCP server + instructions + tool registration
│ ├── server.py # Standalone entry point for isolated dev/testing
│ └── formatter.py # LLM output formatting (optional)
└── tests/
└── test_tools.py
Step 2 — pyproject.toml
[project]
name = "ra-mcp-<name>-mcp"
version = "0.3.0" # match current workspace version
description = "<one-line description>"
readme = "README.md"
requires-python = ">=3.13"
dependencies = [
# Domain package (if one exists):
# "ra-mcp-<name>",
"ra-mcp-common",
"fastmcp==3.4.2",
]
license = "Apache-2.0"
[tool.uv.sources]
# ra-mcp-<name> = { workspace = true } # uncomment if domain pkg exists
ra-mcp-common = { workspace = true }
[build-system]
requires = ["hatchling"]
build-backend = "hatchling.build"
[tool.hatch.build.targets.wheel]
packages = ["src/ra_mcp_<name>_mcp"]
If the package depends on an existing domain package (e.g. ra-mcp-browse),
add it to dependencies and [tool.uv.sources]. If this is a standalone MCP
package (like guide-mcp), just depend on ra-mcp-common + fastmcp.
Step 3 — tools.py
This file creates the FastMCP instance and registers all tools/resources.
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.
- 11d ago First seen · 259 lines · 71 tokens per session scan A ee0d32de01d6
add-mcp-package is a skill published in the GitHub repository AI-Riksarkivet/ra-mcp (23 stars, last pushed yesterday), licensed Apache-2.0. It adds 71 tokens to every session and 2,113 once invoked, about $0.0004 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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