Higgs
Summary
Higgs is a productivity tool whose AI approach and company details remain entirely undisclosed.
Higgs operates as a productivity-oriented AI tool but supplies no details on its actual functions or technical foundation. It occupies the crowded space of workflow aids without revealing any unique architecture or performance metrics. Pricing information is unavailable, with no numbers attached to access or subscriptions. The primary limitation stems from this total lack of documentation, making comparisons to established options impossible.
Bottom line: Use only after specs and pricing appear; skip while information stays absent.
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Feeding encrypted Proton Mail into a cloud inference API defeats end-to-end encryption at the moment it matters most. higgs sidesteps that by connecting to Proton Mail Bridge on 127.0.0.1 and routing all inference to a local model — Gemma 4 via Ollama by default, or any OpenAI-compatible server such as llama.cpp via the PM_LLM_BACKEND=openai flag. The four core operations are classify, search, archive, and Q&A, each emitting NDJSON to stdout. Because output is structured line-by-line with a guaranteed {“type”:”summary”} terminator, commands compose: higgs search INBOX –before 2025-07-01 | higgs archive INBOX –uid – is a complete archival pipeline.
The differentiating design choice is the schema endpoint. Running higgs schema classify returns a JSON manifest of every flag, argument, stdout format, and typed exit code for that subcommand. A local agent calls this once per session and drives the tool from the manifest — no prompt-engineered flag guessing, no regex over prose, no branching on English error strings like “auth error” versus “authentication failed”. Exit codes are an enum, errors carry a typed .error.k field, and the stream always terminates cleanly. The vendor describes this as “engineered for agents from the first byte” and the architecture backs that claim.
Credentials never enter a model’s context window. Bridge credentials are stored in the OS keyring — macOS Keychain, Windows Credential Manager, or libsecret on Linux — with an AES-256-GCM encrypted-file fallback. The project is Apache-2.0, ships with cosign-signed releases and an SBOM, and the vendor states zero telemetry: no analytics, no crash reporting, no update pings. The audit surface is small and verifiable.
The hard constraint is Proton Mail Bridge. Bridge must be installed, running, and authenticated before any higgs command executes; this is not a limitation the tool works around. Teams whose mail lives in Gmail, Fastmail, or self-hosted IMAP outside Proton’s ecosystem have no path to adoption here. Similarly, higgs has no API surface of its own — it is a CLI callable from shell scripts and local agent loops, not an HTTP service you embed in a web application.