What is DirForge CLAUDE.md?

Project instructions for DirForge, a small read-only web app that lists files from a configured home-server or NAS folder. They describe its technology and require security checks such as preventing unsafe paths.

Use them when modifying DirForge’s ASP.NET Core pages, file-listing behavior, authentication, or path and symlink checks.

They keep changes aligned with the app’s read-only design and prevent features from weakening file-access security.

How Dissimilis/DirForge configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to Dissimilis/DirForge. 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/Dissimilis/DirForge/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/Dissimilis/DirForge

Made for: Claude Code.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/dissimilis/dirforge/claude-md/github.svg)](https://agentmods.dev/instructions/dissimilis/dirforge/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/dissimilis/dirforge/claude-md"><img src="https://agentmods.dev/badge/instructions/dissimilis/dirforge/claude-md/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.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/dissimilis/dirforge/claude-md"><img src="https://agentmods.dev/badge/instructions/dissimilis/dirforge/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 1,225 This file is loaded in full into every session.

When invoked 1,225 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.

Model	Per session	Once invoked
Fable 5.1	$0.01225	$0.01225
Opus 5.5	$0.00490	$0.00490
Sonnet 5.5	$0.00245	$0.00245
Haiku 4.5	$0.00122	$0.00122

Measured 2mo ago against content hash 66a474f74fc6, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

DirForge 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 · 161 lines

How it starts

The opening of the file, as written. The whole thing — 161 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

Project

DirForge is a stateless, read-only directory listing web app for homelab/NAS use.

Stack: ASP.NET Core Razor Pages, .NET 10 (net10.0)
Data model: no database, no persistent application state
Dependency model: runtime app uses framework built-ins only
Mission: safely expose files from a configured root with strong defaults

Philosophy

DirForge is intentionally small and opinionated. It is not trying to be a full file platform.

1) Security Before Features

Path traversal prevention, root-constrained resolution, symlink containment, and strict auth handling are mandatory. A feature that weakens these boundaries is not acceptable.

2) Read-Only Means Read-Only

DirForge is a file access and distribution surface, not a file mutation surface. Public endpoints should not write, rename, move, or delete user files.

3) Stateless and Disposable Runtime

In-memory metrics, logs, and one-time-share session state are intentional. Restarting the process should be safe and expected operational behavior.

4) Simplicity Over Cleverness

Prefer direct, readable code over abstractions and micro-optimizations unless there is a measured production problem.

5) Observability Is Product Behavior

Operational endpoints, dashboard, and /metrics are part of the contract. User-visible behavior changes should be reflected in telemetry in the same change.

Non-Negotiable Invariants

All request paths must remain constrained to RootPath.
Symlink traversal cannot escape root scope.
Hide/deny policy must stay consistent across UI, API, WebDAV, S3, and MCP where relevant.
Auth checks must remain strict and timing-safe where applicable.
Endpoint surfaces remain read-only unless the project direction explicitly changes.

Architecture Map

Startup and Composition

src/DirForge/Program.cs
- Configuration load/normalization/validation
- Service graph, middleware order, endpoint mapping
src/DirForge/Models/DirForgeOptions.cs
src/DirForge/Services/DirForgeOptionsResolver.cs
src/DirForge/Services/DirForgeOptionsValidator.cs

Read the full file on GitHub · 161 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.

2mo ago First seen · 161 lines · 1,225 tokens per session scan A 66a474f74fc6

Subscribe to this mod's changes

DirForge CLAUDE.md is an instructions file published in the GitHub repository Dissimilis/DirForge (5 stars, last pushed 4mo ago), licensed MIT. It adds 1,225 tokens to every session, about $0.0049 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.

docker file-browser file-sharing homelab mcp mcp-server

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DirForge: Instructions file for Claude Code