Mole

Deep research with enforced budgets and verified citations.

#deep-research #open-source #budget-control #mcp

Quick answer

Mole — Deep research with enforced budgets and verified citations. It's free. Best for developers automating in-depth research tasks from the terminal with a hard spend cap.

Mole is a free, open-source deep-research agent that runs entirely on your own infrastructure, using your own API keys and a hard, ledger-enforced dollar budget so you never accidentally overspend on a research session. Built for developers and technical users who want terminal-based research automation, Mole ships as a single static binary that integrates with the Model Context Protocol (MCP), meaning a coding agent or other automation tool can drive it programmatically without any extra plumbing. What sets Mole apart from similar tools is its citation-verification step: every quote in the final research output is checked back against the actual source text it came from, rather than simply being formatted to look credible. The budget enforcement is equally rigorous, relying on non-negative database constraints in a ledger so spend is reserved before a call runs and settled after, giving you a genuine ceiling rather than an estimate. Licensed under Apache-2.0 with over 170 commits of development history, Mole is best suited to developers who want full control over model choice, search backends, and spending limits, and who are comfortable wiring up their own API keys in exchange for a transparent, auditable research pipeline.

Key features

Ledger-enforced dollar budget with non-negative database constraints prevents overspending
Single static binary that speaks Model Context Protocol (MCP) for agent integration
Citation verification checks every quoted passage against the original source text
Bring-your-own API keys and search backends for full model and cost control

Pros & cons

PROS

+Budget enforcement is genuine, using a database ledger that reserves cost before each call rather than estimating afterward
+Ships as a single self-contained static binary with MCP support, making integration straightforward for developers
+Apache-2.0 license with a meaningful commit history gives full transparency and freedom to modify or self-host

CONS

−Real-world adoption is very low despite Hacker News attention, so the tool is largely unproven outside early testers
−Output quality depends entirely on the external models and search backends the user configures, none of which are bundled or preconfigured

Pricing

Free tier

Fully free and open source under Apache-2.0

Paid from

Enterprise

Who is it for

→Developers automating in-depth research tasks from the terminal with a hard spend cap
→Coding agents using MCP to delegate deep-research subtasks to Mole programmatically
→Researchers who need verified citations rather than AI-generated references that look plausible but are not checked

Frequently asked questions

Is Mole free?

Yes. Mole is completely free and open source under the Apache-2.0 license. You supply your own API keys, and any dollar figures in the configuration are spend caps you set yourself, not fees charged by Mole.

What is Mole best used for?

Mole is best used for terminal-based deep research workflows where you need a hard spending ceiling and citations that are actually verified against source text. It is particularly well-suited to developers who want to automate research programmatically via MCP.

What are the best alternatives to Mole?

The closest alternative mentioned by the project itself is Webhound. Other comparable open-source or developer-focused research agents include GPT Researcher and similar self-hosted pipelines. Commercial alternatives include Perplexity Pro and OpenAI Deep Research, though those charge subscription fees.

Is Mole safe to use?

Mole is open source under Apache-2.0, so you can audit every line of code. It runs on your own infrastructure with your own API keys and does not route your data through any Mole-controlled servers, which gives you full visibility and control over your data.

How much does Mole cost?

Mole itself costs nothing. The only costs are the API usage fees from the external model providers and search backends you choose to wire up. Mole enforces whatever dollar cap you configure so those third-party costs stay within your chosen limit.

Reviews

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