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fcp-sheets: Instructions file for Claude Code

CLAUDE.md

fcp-sheets CLAUDE.md is an instructions file for Claude Code from os-tack/fcp-sheets. It costs 308 tokens per session, scanned A, original, MIT.

Project instructions for an MCP server that lets AI agents create and edit spreadsheets through plain-language operations. It uses openpyxl, a Python library for working with spreadsheet files.

In plain words
What is it for?
They help agents run the test suite, verify imports, and work on spreadsheet operations, cell references, formatting, charts, tables, and workbook changes.
Why use it?
They document the server structure and rules such as undo, redo, batched changes, and rolling back a batch when an operation fails.

Instructions file for Claude Code

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

This is os-tack/fcp-sheets's own configuration. It tells Claude Code how to work on fcp-sheets 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 fcp-sheets configures →

not rated 2repo 4mo ago A scan 308 tokens original MIT
View source ↗ os-tack/fcp-sheets
Reuse

Borrowing it

Nothing to install: this file belongs to os-tack/fcp-sheets. 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/os-tack/fcp-sheets/main/CLAUDE.md
Clone the repo
git clone --depth 1 https://github.com/os-tack/fcp-sheets

Made for: Claude Code.

Wrote this? Show the measurements

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README.md
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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.

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<a href="https://agentmods.dev/instructions/os-tack/fcp-sheets/claude-md"><img src="https://agentmods.dev/badge/instructions/os-tack/fcp-sheets/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 308 This file is loaded in full into every session.
When invoked 308 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 $0.00308 $0.00308
Opus 5.5 $0.00123 $0.00123
Sonnet 5.5 $0.00062 $0.00062
Haiku 4.5 $0.00031 $0.00031

Measured 2mo ago against content hash eacdeb5666ed, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

fcp-sheets 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 · 25 lines

What it actually says

fcp-sheets

Project Overview

MCP server that lets LLMs create and edit spreadsheets through a semantic verb DSL. Uses openpyxl as the native library (Tier 2 architecture).

Architecture

  • src/fcp_sheets/model/ — Thin wrapper around openpyxl Workbook, cell ref parser, sheet index
  • src/fcp_sheets/server/ — Verb handlers (ops_*.py), queries, verb registry, resolvers
  • src/fcp_sheets/lib/ — Color palette, number formats, chart types, table styles
  • src/fcp_sheets/adapter.py — FcpDomainAdapter bridging fcp-core to openpyxl
  • src/fcp_sheets/main.py — Server entry point

Key Patterns

  • Each ops_*.py exports a HANDLERS dict mapping verb names to handler functions
  • The adapter merges all HANDLERS at import time for dispatch
  • queries.py exports QUERY_HANDLERS for query dispatch
  • Block mode: data lines buffered in adapter, flushed on data end
  • Undo/redo: byte snapshots via wb.save(BytesIO) / load_workbook(BytesIO)
  • Batch atomicity: pre-batch snapshot, rollback on any op failure

Commands

  • uv run pytest — Run tests
  • uv run python -c "from fcp_sheets.main import main" — Verify import
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 · 25 lines · 308 tokens per session scan A eacdeb5666ed

Subscribe to this mod's changes

fcp-sheets CLAUDE.md is an instructions file published in the GitHub repository os-tack/fcp-sheets (2 stars, last pushed 4mo ago), licensed MIT. It adds 308 tokens to every session, about $0.0012 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.

DocumentsLLMSpreadsheetsmcpmodel-context-protocolxlsx
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