molclaw-file-transfer

molclaw-file-transfer is a skill for Claude Code, Codex from InternScience/MolClaw. It costs 21 tokens per session (544 once invoked), scanned A, original, MIT.

Instructions for sending files between a local computer and a remote tool server by converting the file contents to Base64, a text format for binary data.

In plain words
What is it for?
Preparing a local file, encoding it, transferring it to the server, and obtaining the saved server-side file path for later tool use.
Why use it?
They address the situation where the remote server cannot directly access files stored on the local computer.

Skill for Claude CodeCodex

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

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/internscience/molclaw/molclaw-file-transfer
Any agent
npx skills add InternScience/MolClaw --skill molclaw-file-transfer
Clone the repo
git clone --depth 1 https://github.com/InternScience/MolClaw

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 molclaw-file-transfer

README.md
[![agentmods](https://agentmods.dev/badge/skills/internscience/molclaw/molclaw-file-transfer.svg)](https://agentmods.dev/skills/internscience/molclaw/molclaw-file-transfer)
Your own site
<a href="https://agentmods.dev/skills/internscience/molclaw/molclaw-file-transfer"><img src="https://agentmods.dev/badge/skills/internscience/molclaw/molclaw-file-transfer.svg" alt="Measured on agentmods" height="20"></a>
Per session 21 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 544 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 $0.00021 $0.00544
Opus 5 $0.00010 $0.00272
Sonnet 5 $0.00004 $0.00109
Haiku 4.5 $0.00002 $0.00054

Measured 6d ago against content hash db0a53acdd41, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

molclaw-file-transfer 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 6d 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.

skills/L1_tools/molclaw-file-transfer/SKILL.md · 79 lines

What it actually says

File Transfer

Note:

  • Local files are not directly accessible by the server. Please upload them to the server using molclaw-file-transfer before execution.
  • For PDB file inputs, it is recommended to preprocess them using molclaw-pdbfixer before execution.
  • Please refer to skill molclaw-scp-server to complete tool invocation.

1. Transfer local file to SCP server

Example code:

import base64

client = DrugSDAClient("https://scp.intern-ai.org.cn/api/v1/mcp/2/DrugSDA-Tool")
if not await client.connect():
    print("connection failed")
    return

## Convert local file to base64 string
local_file = "/path/a.txt"		#Input local file path
with open(local_file, "rb") as f:
    file_content = f.read()
    file_base64_string = base64.b64encode(file_content).decode('utf-8')

## Call tool base64_to_server_file to save base64 string as server file
response = await client.session.call_tool(
    "base64_to_server_file",
    arguments={
        "file_name": "a.txt",
        "file_base64_string": file_base64_string
    }
)
result = client.parse_result(response)
save_file = result["save_file"]	#Server file path after transfer	

await client.disconnect() 

2. Transfer SCP server file to local

Example code:

import base64

client = DrugSDAClient("https://scp.intern-ai.org.cn/api/v1/mcp/2/DrugSDA-Tool")
if not await client.connect():
    print("connection failed")
    return

## Call tool server_file_to_base64 to convert server file to base64 string
response = await client.session.call_tool(
    "server_file_to_base64",
    arguments={
        "file_path": "/path/a.txt" 	#Input server file path
    }
)
result = client.parse_result(response)
base64_string = result["base64_string"]
file_name = result["file_name"]

## Convert base64 string to local file
file_data = base64.b64decode(base64_string)    
local_file_path = "/path/" + file_name
with open(local_file_path, "wb") as f:
    f.write(file_data)

await client.disconnect()
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. 6d ago First seen · 79 lines · 21 tokens per session scan A db0a53acdd41

Subscribe to this mod's changes

molclaw-file-transfer is a skill published in the GitHub repository InternScience/MolClaw (33 stars, last pushed 29d ago), licensed MIT. It adds 21 tokens to every session and 544 once invoked, about $0.0001 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 2026-08-30.

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