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sc-mcp: Instructions file for Claude Code

CLAUDE.md

sc-mcp CLAUDE.md is an instructions file for Claude Code from ratulotron/sc-mcp. It costs 692 tokens per session, scanned A, original, MIT.

Maintenance instructions for sc-mcp, a server that wraps the Scalable Capital command-line tool. They explain how to check for changes when a new version of that tool is released.

In plain words
What is it for?
Use them when upgrading sc-mcp, checking supported commands and flags, updating broker data tools, or changing its version information.
Why use it?
They reduce the risk that the server stops working when the underlying command-line tool changes.

Instructions file for Claude Code

Written for Claude Code: the file is CLAUDE.md.

This is ratulotron/sc-mcp's own configuration. It tells Claude Code how to work on sc-mcp itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything sc-mcp configures →

not rated 0repo 4mo ago A scan 692 tokens original MIT
View source ↗ ratulotron/sc-mcp
Reuse

Borrowing it

Nothing to install: this file belongs to ratulotron/sc-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.

Copy the file
curl -O https://raw.githubusercontent.com/ratulotron/sc-mcp/main/CLAUDE.md
Clone the repo
git clone --depth 1 https://github.com/ratulotron/sc-mcp

Made for: Claude Code.

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Per session 692 This file is loaded in full into every session.
When invoked 692 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00692 $0.00692
Opus 5.5 $0.00277 $0.00277
Sonnet 5.5 $0.00138 $0.00138
Haiku 4.5 $0.00069 $0.00069

Measured 2mo ago against content hash fb6d64a95570, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

sc-mcp 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 · 66 lines

How it starts

The opening of the file, as written. The whole thing — 66 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Maintaining sc-mcp

This server is a thin wrapper around the Scalable Capital sc CLI. Its main maintenance burden is staying in sync with sc, which is pre-1.0 and can change its command surface between minor versions.

When a new sc version ships

Run the machine-readable capability dump and compare it against what the server assumes:

sc --version
sc capabilities --json | python3 -m json.tool | less
  1. Version. Compare data.version to SUPPORTED_SC_VERSION in src/sc_mcp/server.py. If the major.minor changed, work through the rest of this list, then bump the constant.
  2. Commands. Diff data.commands against the 8 tools in server.py (broker.overview, broker.holdings, broker.transactions, broker.transaction.details, broker.analytics, broker.quote, broker.search, broker.security-news). New read-only broker command → consider adding a tool. Renamed/removed → update or drop the tool.
  3. Flags. For each wrapped command, re-check its --help. If a flag the server passes was renamed or removed, fix the tool and its case in ARGV_CASES in tests/test_sc_mcp.py.
  4. Exit codes / envelope. data.exit_codes and data.output describe the error and JSON-envelope contract _run_sc relies on. If they change, adjust error handling.
  5. Update the Compatibility line in README.md and SUPPORTED_SC_VERSION.

Before committing

uv run ruff check . && uv run ruff format --check . && uv run pytest

Versioning the change

SemVer on the tools (see README → Versioning): tool removed/renamed = MAJOR, tool/optional-param added = MINOR, fix = PATCH. Then:

git tag -a vX.Y.Z -m "vX.Y.Z" && git push origin vX.Y.Z
gh release create vX.Y.Z --title vX.Y.Z --notes "..."

Then rebuild the Claude Desktop bundle (its manifest pins both version and the @vX.Y.Z git ref):

# bump version + git ref in mcpb/manifest.json, then:
npx -y @anthropic-ai/mcpb pack mcpb dist/sc-mcp.mcpb
gh release upload vX.Y.Z dist/sc-mcp.mcpb

Read the full file on GitHub · 66 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.

  1. 2mo ago First seen · 66 lines · 692 tokens per session scan A fb6d64a95570

Subscribe to this mod's changes

sc-mcp CLAUDE.md is an instructions file published in the GitHub repository ratulotron/sc-mcp (0 stars, last pushed 4mo ago), licensed MIT. It adds 692 tokens to every session, about $0.0028 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 2026-08-31.

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