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 instructions/ceesaxp/gridka/claude-mdgit clone --depth 1 https://github.com/Ceesaxp/gridkaWrote 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/instructions/ceesaxp/gridka/claude-md)<a href="https://agentmods.dev/instructions/ceesaxp/gridka/claude-md"><img src="https://agentmods.dev/badge/instructions/ceesaxp/gridka/claude-md.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 | $0.01293 | $0.01293 |
| Opus 5 | $0.00647 | $0.00647 |
| Sonnet 5 | $0.00259 | $0.00259 |
| Haiku 4.5 | $0.00129 | $0.00129 |
Grade A, and why
gridka 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 4d 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 — 99 lines — stays where its author put it; the contents beside it link to each section on GitHub.
CLAUDE.md
Project Overview
Gridka is a native macOS CSV viewer built with Swift (AppKit) and DuckDB (C API). It handles very large files (100M+ rows) via virtual scrolling and SQL-backed data access. The UI is purely AppKit — no SwiftUI, no web views, no Electron.
Architecture Rules
- Single process. DuckDB is embedded via C API through a bridging header. No IPC, no separate backend.
- AppKit only. Use
NSTableView(view-based, with data source delegate),NSView,NSViewController. Never use SwiftUI. - Every user interaction is SQL. Sort, filter, search all mutate a
ViewStatestruct which is translated to a SQL query byQueryCoordinator. No in-memory data manipulation in Swift. - Serial query execution. All DuckDB calls go through a single serial
DispatchQueue. DuckDB connections are not thread-safe. UI updates dispatch back to main. - Page-based row cache.
RowCachefetches pages of 500 rows. Max 20 pages cached. LRU eviction. Never load all rows into memory.
Key Domain Types
FileSession— represents one opened file, owns the DuckDB connection and tableViewState— current sort, filters, search term, visible range. Immutable value type. Every change produces a new ViewState.QueryCoordinator— pure function:ViewState → SQL String. No side effects. Highly testable.RowCache— LRU cache of fetched row pages. Cache key is page index. Invalidated when ViewState changes filters/sort.DuckDBEngine— thin wrapper around DuckDB C API. Owns database and connection lifecycle.ColumnDescriptor— column name, DuckDB type, display type, index.ColumnFilter— column name, operator, value. Type-aware operators.
Code Conventions
- Swift 5.10+, target macOS 14.0+
- No third-party dependencies beyond DuckDB static library
- Use
final classfor all classes unless inheritance is explicitly needed - Prefer value types (structs, enums) for model layer
- Error handling: define errors in
GridkaErrorenum, throw from engine layer, handle in UI layer - Use
DispatchQueuefor concurrency (not async/await — AppKit delegate patterns don't mix well) - All SQL strings are parameterized or escaped via helper functions. Never interpolate user input directly.
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.
- 4d ago First seen · 99 lines · 1,293 tokens per session scan A 55d036ac152d
gridka CLAUDE.md is an instructions file published in the GitHub repository Ceesaxp/gridka (10 stars, last pushed 15d ago), licensed MIT. It adds 1,293 tokens to every session, about $0.0065 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 2026-08-31.
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