HammerCLI is an open-source command-line tool designed to capture and score git commits for their relevance to R&D tax credit programs, such as Canadian SR&ED and US IRS Section 41. It operates by installing a post-commit hook in git repositories, allowing teams to automatically gather audit-ready evidence for qualifying engineering work without altering their existing development workflow. The tool targets both developers and finance teams seeking to streamline compliance and maximize tax credit claims by ensuring that supporting evidence is collected directly at the source.
Once installed via PyPI and registered through an email verification process, HammerCLI silently scores every commit in the background using a managed scoring API. This process leverages a large language model (LLM) with prompts tailored to specific compliance domains, currently supporting SR&ED and IRS Section 41, with planned expansion to PCI and SOC 2. Commits are rated on a scale—Strong, Moderate, Weak, Minimal—based on their tax credit relevance. The tool is non-blocking, runs without user prompts or UI, and does not interfere with existing git hooks, allowing developers to continue their normal workflow.
HammerCLI provides a suite of 15 commands, with core functionality accessed through commands such as 'hammer init' for registration, 'hammer install' for setting up post-commit hooks, 'hammer status' and 'hammer log' for viewing scored commits, and 'hammer push' to send qualifying evidence into HammerLedger, where it becomes part of a cryptographically-sealed audit chain. Additional features include exporting scored commits to JSON or CSV, retrying failed scores, per-repo domain overrides, and diagnostic checks. The tool works with any git repository and is compatible with macOS, Linux, and Windows (Git Bash).
The service is offered under a free forever tier, covering up to 1,000 scored commits per month, which is sufficient for most early-stage teams. Heavier usage can be upgraded to paid plans, including CLI Pro and HammerLedger. HammerCLI is part of the HammerAI ecosystem, integrating with related tools such as HammerR&D (JIRA) and HammerLedger, and is maintained by HammerAI Inc.
In the CLI tools & terminal space, HammerCLI takes a focused approach. It focuses on automating the capture and scoring of R&D evidence from git commits for tax credit compliance. It is built as an open-source project for developers and finance teams managing R&D tax credits. HammerCLI is open source under the MIT license. HammerCLI is available on the command line.
Behind HammerCLI is HammerAI, and the product first shipped in 2026. Development happens publicly on GitHub with 1 commits in the last 90 days. Key capabilities include git commit scoring, R&D tax credit analysis, and silent background operation.
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