What is Ethos?

Ethos is a TypeScript framework where personality is the unit of architecture. Not a system prompt string. A directory of files that, when switched, atomically changes the agent's prompt, tool access, memory scope, and model.

The one-sentence pitch

A personality lives at ~/.ethos/personalities/<id>/ and contains three files:

<id>/
├── SOUL.md        first-person identity (how do I speak, what am I for)
├── config.yaml     name, description, model, memoryScope, budget, fs_reach
└── toolset.yaml    flat list of allowed tool names

Switching from researcher to engineer mid-chat does not just swap a system prompt. It atomically swaps:

The system prompt (SOUL.md)
The tools the agent can call (toolset.yaml)
Whether memory is shared with the user-default scope or isolated (memoryScope)
Which model handles the next turn (model)

You cannot accidentally run the engineer personality's write-shaped tools under the reviewer's read-only toolset. The four dimensions move together.

What you get out of the box

Three personalities ship by default for everyday use. Each has its own role, tools, and voice.

Personality	Role	Tools	Voice
`researcher`	Explores, summarises, cites	Read, search, browse	Curious, citation-heavy
`engineer`	Writes and edits code	Read, write, run, test	Direct, code-first
`reviewer`	Critiques diffs and designs	Read-only	Caution-first, structured

Two additional system personalities — personality-architect and team-architect — are available for building and managing other personalities.

Beyond personalities, the framework ships:

CLI — ethos chat with streaming output, slash commands, and zero mode (ethos -z "prompt") for one-shot scripting.
Inline context — @file and @url references that auto-inline files and URLs as context before the LLM sees the prompt.
Web dashboard — full React SPA (ethos serve --web) with chat, session browser, personality management, skills library, MCP server config, plugin management, memory viewer, team boards, mesh visualization, cron job scheduling, activity feed, batch/eval runs, and custom dashboards with plugin data sources. See Use the web dashboard.
Desktop app — Electron app with system tray, quick-chat overlay, global shortcuts, auto-update, and OS keychain integration. Runs local or remote. See Desktop app.
VS Code extension — sidebar panel that brings the agent into the editor.
Nine surfaces — CLI, web dashboard, desktop app, VS Code extension, and five channel adapters (Telegram, Discord, Slack, WhatsApp, Email). Same agent, same memory, same sessions across all of them.
Plugin ecosystem — plugins register tools, hooks, providers, slash commands, and data sources. Plugins declare widget templates in widgets.yaml. Default-deny allowlists per personality. See Plugin SDK reference.
Custom dashboards — draggable panel grid powered by plugin data sources, SQL queries, cron auto-refresh, and inter-panel communication. See Build a custom dashboard.
Skill evolution — @ethosagent/skill-evolver analyzes eval output, proposes skill rewrites and new skills, with a human approval queue in web and desktop. See Manage skill evolution.
Persistent sessions in SQLite, scoped per working directory.
Plain-text memory files (MEMORY.md, USER.md) you can read, grep, edit, and commit.
Skill discovery that picks up your existing libraries from Claude Code, OpenClaw, OpenCode, and Hermes — no porting.
Scheduled tasks via a single cron tool — daily briefings, weekly reports, recurring prompts.
Teams that decompose multi-part requests into specialist tasks on a durable kanban board with an audit trail.
Admin panel — MCP server management, channel webhooks, API key rotation from the browser. See Use the admin panel.

What Ethos is not

Not a chatbot SDK. Ethos does not generate a website chat widget for you. It's the agent runtime; you bring the interface.
Not a workflow engine. Ethos does not chain steps into pipelines or DAGs. The unit is a turn — a user message in, streamed events out.
Not a multi-model router. A personality declares one model. If you want different models per turn, you use different personalities.
Not a no-code tool. Personalities are config files, but extending Ethos (new tools, new providers, new channel adapters) is TypeScript code against typed interfaces.

The shape of a turn

You send a message. The agent reads memory, builds a prompt, calls the LLM, executes any tools the LLM requests (in parallel, within a budget), syncs memory, and emits a stream of typed events while it does it.

That stream — every event — is one of eight types: text_delta, thinking_delta, tool_start, tool_progress, tool_end, usage, error, done. Every surface — CLI, web dashboard, desktop app, VS Code extension, channel adapters (Telegram, Discord, Slack, WhatsApp, Email) — consumes this stream and renders what it wants.

Architecture in 90 seconds shows the full diagram.

Why this matters

The trade-offs add up to a specific kind of agent:

A specialist, not a generalist. Because the personality is structural, you can credibly say "the reviewer cannot edit files" — it's enforced at the toolset boundary, not just discouraged in the prompt.
Multi-platform from day one. Sessions are keyed per working directory, not per platform. A conversation started on Telegram continues on the CLI, the desktop app, or any of the eight surfaces.
Yours to read. Memory is plain markdown. Config is plain YAML. Skills are plain markdown with frontmatter. You can grep, diff, and commit any of it.
Yours to extend. Every extension point — provider, tool, adapter, memory backend, personality source — is a typed interface in @ethosagent/types. Implement, inject, ship.

Sessions and teams travel with you

Sessions are platform-agnostic. A session is keyed by working context, not by the surface you're talking through. Start a conversation in Telegram, keep going from the CLI on your laptop, switch from researcher to engineer mid-thread — the same memory, the same history, the same scratchpad follow you across personalities and platforms. The channel is just the door.

Teams coordinate across specialties. One personality is an agent; a team is a roster. You ask the team coordinator for something multi-part — "research the migration, draft the plan, review it" — and it decomposes the request into typed tasks on a durable kanban board. Specialist personalities claim work, post status updates, hand off, and surface blockers. The board, the audit trail, and the assignments survive restarts. See Run a team with a shared kanban board.

Plugins, data sources, and dashboards

A plugin registers tools, hooks, providers, and slash commands in a single activate() call — the framework surfaces each command on every surface automatically. Plugins also declare data sources: typed queries that return rows for dashboards. A market-data plugin might expose top_gainers and sector_heatmap; a DevOps plugin might expose deploy_history and incident_timeline.

The web dashboard's custom dashboards consume these data sources. You build a draggable panel grid, wire each panel to a data source or a raw SQL query, set a cron refresh interval, and panels communicate — clicking a row in one panel filters another. The pipeline is: plugin registers data source, dashboard panel queries it, cron refreshes it, user sees live data alongside chat.

See Register a plugin data source and Build a custom dashboard.

The one-sentence pitch​

What you get out of the box​

What Ethos is not​

The shape of a turn​

Why this matters​

Sessions and teams travel with you​

Plugins, data sources, and dashboards​

See also​