Higgs
Summary
Higgs is a productivity tool with no documented function or positioning.
No details exist on what Higgs does or the workflow problem it targets. The directory records its pricing tier as unknown and states it is not open source. Without any concrete pricing figure, model name, or stated differentiator, no assessment of value or trade-offs can be made. The sole verifiable fact is the absence of public information on capabilities or costs.
Bottom line: Do not consider Higgs until verifiable details appear.
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Most email AI tools require you to hand your messages to a cloud API. higgs inverts that: it runs entirely on your machine, connecting to your Proton Mail inbox through Proton Mail Bridge on 127.0.0.1 and routing inference to a local model you host — Gemma 4 via Ollama by default, or any OpenAI-compatible server like llama.cpp via the PM_LLM_BACKEND=openai flag. The core workflow is a CLI pipeline: classify labels your inbox with confidence scores, search filters by date or folder, archive acts on those results, and ask runs Q&A over your mail — all composable with Unix pipes because NDJSON output flows cleanly from one command into the next.
The agent-contract design separates higgs from tools that were bolted onto an agent layer after the fact. Running higgs schema returns a full JSON manifest of every subcommand — flags, arguments, stdout format, and an enumerated set of exit codes — so an agent loads the spec once and drives commands without reparsing –help prose every session. Output terminates with a guaranteed {“type”:”summary”} object, so agents know when a stream ends without timing heuristics. Errors are typed keys, not English strings, so branching on retry logic is deterministic. The vendor page describes this explicitly as an agent-first contract, not a convenience feature added later.
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 — and nothing sensitive enters the model’s context window. The project is Apache-2.0 licensed, ships with zero telemetry, and releases are cosign-signed with an accompanying SBOM so you can verify the exact build you’re running. This architecture works well for a developer building a local automation loop over a Proton Mail account; it stops working the moment the target inbox is Gmail, Fastmail, or any provider that does not support Proton Mail Bridge.