agentmods.dev

mcp-roots-snapshot-paging

mcp-roots-snapshot-paging is a skill for Claude Code, Codex from alonf/MCPPythonDemo. It costs 0 tokens per session (316 once invoked), scanned A, original, MIT.

A design pattern for adding safe file and folder reading to an MCP server. MCP (Model Context Protocol) lets an AI agent use tools and read structured resources.

In plain words
What is it for?
Use it to add access requests, file snapshots, folder snapshots, path validation, authorization, and paginated resource responses to an MCP server.
Why use it?
It prevents unsafe paths, directory traversal, and symlink escapes while keeping existing tools working. It also gives the agent a consistent way to read large results in pages.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

not rated 0 4mo ago A scan 0 tokens original MIT
View the source file alonf/MCPPythonDemo
Install

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.

agentmods
npx agentmods add skills/alonf/mcppythondemo/mcp-roots-snapshot-paging
Any agent
npx skills add alonf/MCPPythonDemo --skill mcp-roots-snapshot-paging
Clone the repo
git clone --depth 1 https://github.com/alonf/MCPPythonDemo

Made for: Claude Code, Codex.

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.

agentmods badge for mcp-roots-snapshot-paging

README.md
[![agentmods](https://agentmods.dev/badge/skills/alonf/mcppythondemo/mcp-roots-snapshot-paging.svg)](https://agentmods.dev/skills/alonf/mcppythondemo/mcp-roots-snapshot-paging)
Your own site
<a href="https://agentmods.dev/skills/alonf/mcppythondemo/mcp-roots-snapshot-paging"><img src="https://agentmods.dev/badge/skills/alonf/mcppythondemo/mcp-roots-snapshot-paging.svg" alt="Measured on agentmods" height="20"></a>
Per session 0 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 316 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00000 $0.00316
Opus 5 $0.00000 $0.00158
Sonnet 5 $0.00000 $0.00063
Haiku 4.5 $0.00000 $0.00032

Measured 5d ago against content hash 5453d31b3b10, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-05, from the pricing page.

Security

Grade A, and why

mcp-roots-snapshot-paging 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 5d 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.

.squad/skills/mcp-roots-snapshot-paging/SKILL.md · 39 lines

What it actually says

MCP Roots + Snapshot Paging Skill

Use When

You need to add a safe sandboxed read surface to an MCP server without breaking older tools.

Pattern

  1. Keep the new sandbox feature additive:
    • preserve older tools unchanged
    • add a dedicated request_*_access tool plus a dedicated snapshot tool
  2. Put all normalization and authorization in one validator:
    • absolute-path requirement
    • traversal rejection
    • supported-root restriction
    • symlink-escape rejection
    • allowed-root match before reading
  3. Reuse the existing snapshot/resource UX:
    • tool returns {resource_uri, paginated_resource_template}
    • resource returns metadata + entries + pagination
  4. Page different source kinds with the same envelope:
    • file snapshots → line entries
    • directory snapshots → deterministic child metadata entries
  5. Tell the model the order explicitly:
    • request_*_access first for blocked paths
    • create_*_snapshot second
    • read_resource third
  6. Be defensive with MCP resource query handling:
    • register the paged template
    • also parse ?limit=...&offset=... if it leaks through the base {id} route

Reference Files

  • src/mcp_linux_diag_server/tools/proc_snapshots.py
  • src/mcp_linux_diag_server/server.py
  • src/mcp_linux_diag_server/client.py
  • tests/test_proc_snapshots.py
  • tests/test_m7_http.py
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. 5d ago First seen · 39 lines · 0 tokens per session scan A 5453d31b3b10

Subscribe to this mod's changes

mcp-roots-snapshot-paging is a skill published in the GitHub repository alonf/MCPPythonDemo (0 stars, last pushed 4mo ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 316 tokens. 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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