Higgs
Summary
Higgs is a productivity tool with no documented differentiator or details on record.
No information exists on what Higgs actually does or the problem it addresses. It is marked as closed source with unknown pricing and no listed strengths or weaknesses. Absent any concrete details on functionality, cost, or performance, the tool cannot be assessed or compared to alternatives.
Bottom line: Skip until verifiable details on purpose and pricing appear.
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Sending Proton Mail through a cloud inference API strips the encryption that made Proton worth choosing. higgs solves that by keeping every byte on 127.0.0.1: mail flows through Proton Mail Bridge, a local model handles classification, search, summarization, and Q&A, and no code path routes anything to an external service. The vendor states zero telemetry — no analytics, no crash reporting, no update pings — and releases are cosign-signed with an attached SBOM so you can verify exactly what you’re running. Installation is via Homebrew, go install, or signed release tarballs.
The agent contract is what separates higgs from a shell script wrapper. Running higgs schema returns a JSON manifest of every subcommand — flags, arguments, stdout format, and typed exit codes — so an agent driving higgs loads the schema once and never guesses flags from –help prose again. Output streams as NDJSON with a guaranteed {“type”:”summary”} terminator, which means the agent knows when a stream ends without waiting on timeouts or heuristics. Error handling branches on typed .error.k fields, not on English string matching between ‘authentication failed’ and ‘auth error’. Commands compose via –uid piping: higgs search INBOX –before 2025-07-01 | higgs archive INBOX –uid – chains two operations without intermediate files or custom glue code.
Bridge credentials never enter the model’s context window — they live in the OS keyring (macOS Keychain, Windows Credential Manager, libsecret) with an AES-256-GCM encrypted-file fallback. The default model is Gemma 4 via Ollama; switching to llama.cpp or any OpenAI-compatible server is a single environment variable: PM_LLM_BACKEND=openai. The tool is Apache-2.0 licensed with no paid tier or cloud option described by the vendor.
The fit is narrow by design. higgs works only with Proton Mail via Bridge — no other providers. Local inference means output quality and latency are bounded by the hardware and model you run yourself. Teams that need a visual interface, multi-provider inbox support, or model capacity beyond a local GPU will exhaust what higgs offers quickly.