DeepSeek-backed MoonBit coding agent

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Version

0.3.0

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Apache-2.0

Repository

github.com/bobzhang/openseek

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yesterday

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#bobzhang/openseek

OpenSeek is a small MoonBit foundation for an OpenAI-compatible coding agent supporting DeepSeek, Kimi, and Z.AI GLM models. The module is split into pure data, HTTP transport, agent orchestration, and a CLI entry point so request encoding can be tested without network access.

For a picture of how the pieces fit together — module architecture, the core data model, and the life of one agent turn — see docs/architecture.md.

#Monorepo development

The root moon.work develops OpenSeek, the desktop app, and the moonbitlang/editor source together. The editor keeps its smaller editor/moon.work as a scoped entry point for editor-only builds and browser tests; root Moon commands are the integration gate across both projects.

A fresh checkout needs the MoonBit toolchain and just; just check also requires jq to inspect structured compiler diagnostics. The root integration gates are:

just check              # native + JS workspace checks and formatting
just test               # native + JS workspace tests and OpenSeek cram tests
just build              # native + JS MoonBit builds
just editor-build       # editor web distribution and server
just editor-test        # editor-only tests on every supported target
just editor-test-browser

The editor browser suites additionally need Node.js 18 or newer, the locked npm dependencies, and a Playwright-managed Chromium installation:

cd editor
npm ci
npx playwright install chromium

Linux hosts that lack Playwright's system dependencies can use the CI form, npx playwright install --with-deps chromium.

Neither editor reference submodule is needed for the normal build, test, or browser smoke gates. Initialize CodeMirror only for source-reference research; initialize VS Code only for the opt-in editor performance suite:

git submodule update --init editor/codemirror # source-reference research
git submodule update --init editor/vscode     # opt-in performance suite

#Packages

Package	Purpose	Docs
bobzhang/openseek	Root package and module overview.	README.mbt.md
bobzhang/openseek/deepseek	Pure chat data, provider-aware JSON encoding, and response decoding.	deepseek/README.mbt.md
bobzhang/openseek/deepseek/client	Native-only HTTP transport for supported chat-completions providers.	deepseek/client/README.mbt.md
bobzhang/openseek/agent_runtime	Native-only agent task-group and extensible runtime event queue.	agent_runtime/README.mbt.md
bobzhang/openseek/agent_session	Typed durable conversation state and DeepSeek message projection.	agent_session/README.mbt.md
bobzhang/openseek/agent_session/store	Native filesystem-backed append-only session store.	agent_session/store/README.mbt.md
bobzhang/openseek/agent_session/log	Lenient session-file reader: header plus events, with per-line error capture.	—
bobzhang/openseek/agent_session/compact	Context-checkpoint (compaction) request building and summary handling.	—
bobzhang/openseek/agent_tool	Tool registry, executor, output, and control-action types; one subpackage per built-in tool.	agent_tool/README.mbt.md
bobzhang/openseek/agent_skill	Workspace skills: markdown playbooks discovered from skill libraries and listed in the system prompt.	agent_skill/README.mbt.md
bobzhang/openseek/jsonrpc	Duplex JSON-RPC 2.0 client (concurrent requests, notifications, out-of-order replies).	—
bobzhang/openseek/mcp (+ config, stdio, streamhttp, tools)	MCP client: mcp.json decoding, stdio and Streamable HTTP transports, and the bridge that namespaces server tools into the registry.	—
bobzhang/openseek/prompt	Built-in system prompt text (generated from Markdown) and prompt-selection policy.	prompt/README.mbt.md
bobzhang/openseek_protocol	Typed engine event stream (own module): the openseek run/serve stdout wire contract, decodable on every backend.	protocol/README.mbt.md
bobzhang/openseek_protocol/emit	Native-only writer for that stream: owns each event's log level.	protocol/emit/README.mbt.md
bobzhang/openseek/agent	Native-only OpenSeek agent loop and local tool dispatch.	agent/README.mbt.md
bobzhang/openseek/agent_review	Read-only, compiler-grounded code-review engine behind openseek review.	agent_review/README.mbt.md
bobzhang/openseek/cmd/openseek	Native-only headless automation CLI (openseek).	cmd/openseek/README.md
bobzhang/openseek/cli	Shared command-main helpers: the agent options (--api-key, --model, …) and failure-text sanitizer used by openseek and the out-of-tree openseek_tui.	—
bobzhang/openseek/viz	Browser viewer for durable session logs (JS).	viz/README.md
bobzhang/inspect (in inspect/, own module)	HTTP server (native or wasm) that serves the visualizer over recorded sessions.	inspect/README.md
bobzhang/openseek-viz-app (in cmd/viz_app/, own module)	JS entry point compiled into the visualizer bundle.	viz/README.md
moonbitlang/editor (in editor/, own module)	Reusable readonly editor plus its reference browser shell and server.	editor/README.md
bobzhang/openseek/internal/{cli,workspace_path}	Shared CLI accessors and workspace-path resolution for the command mains.	—
bobzhang/openseek/testkit/filesystem	JSON-backed virtual filesystem for tests and eval fixtures.	testkit/filesystem/README.mbt.md
bobzhang/openseek/eval/report	Shared Markdown/JSON report primitive for deterministic and model evals.	eval/report/README.mbt.md
bobzhang/openseek/eval/tool_harness	Deterministic host-side harness that dispatches every built-in tool.	eval/tool_harness/README.mbt.md
bobzhang/openseek/eval/file_edit/cases	Deterministic file-editing eval case definitions.	eval/file_edit/README.md
bobzhang/openseek/eval/file_edit/harness	Reusable file-editing eval runner, oracle, and reporter.	eval/file_edit/README.md
bobzhang/openseek/eval/file_edit/cmd/main	Native-only CLI wrapper for the file-editing eval harness.	eval/file_edit/README.md
bobzhang/openseek/eval/prompt_task/harness	Prompt-task eval: runs the real agent over isolated per-trial workspaces.	eval/prompt_task/README.md
bobzhang/openseek/eval/session_analyzer	Post-hoc session-log analyzer producing Markdown/HTML/JSON reports.	—
openseek_desktop (in desktop/, own module)	Desktop app: CEF shell (Proton, a registry dependency) plus a JS frontend driving the engine over JSONL.	desktop/README.md

The deepseek subpackage is pure and exposes chat data plus JSON helpers:

Model and Role
ChatMessage(role, content=...) with strongly typed Role values
ToolDefinition(name, description, parameters, strict?) for native tool calls
ChatResponse with FromJson response decoding

It has no HTTP dependency and is suitable for blackbox tests and portable request/response handling.

The deepseek/client subpackage exposes the HTTP client:

Client(api_key~, model?, api_url?)
Client::chat(messages, tools?)

It depends on moonbitlang/async/http and is native-only.

The agent_tool package exposes the local tool registry and typed executor boundary. Tool executors return ToolAction: normal tools use Respond(ToolOutput(...)), while control tools such as finish use Control(Finish(...)).

The agent_runtime package owns loop-scoped task-group access and an extensible event queue available to stateful tools.

The agent_session package owns typed durable conversation state, append-only session events, JSON round-tripping, and projection from a session into DeepSeek chat messages. It is separate from TUI transcript rendering so resumable sessions can be type-safe and process-independent. The native agent_session/store package persists those sessions as a small header plus an append-only JSONL event log.

The agent subpackage contains the OpenSeek agent loop, native DeepSeek tool-call handling, and local tool dispatch. It depends on deepseek/client, filesystem, and process APIs.

#Agent CLI

The cmd/openseek package is the headless automation entry point — a subcommand tree (run/serve/review/subrun/mcp/sessions). The interactive terminal UI is the separate openseek_tui binary, maintained in its own repository, moonbitlang/openseek_tui. openseek run parses arguments and runs the agent package. The agent sends DeepSeek native function tools and supports eleven local tools: mbtx — both the scripting surface and the command runner, spawning processes through the shell-free moonbitlang/async/shell API, with job_output and job_stop watching anything it detaches as a background job — plus read, edit, multi_edit, write, remove, plan, goal, and finish. There is no shell tool, so no command ever goes through a shell.

export DEEPSEEK=sk-...
moon run cmd/openseek -- run "inspect this project and finish with a short summary"

For Kimi models, set KIMI instead:

export KIMI=sk-...
moon run cmd/openseek -- --model kimi-k2.7-code-highspeed run "inspect this project"

For Z.AI GLM models, set GLM:

export GLM=...
moon run cmd/openseek -- --model glm-5.3 run "inspect this project"

OPENSEEK_MODEL is optional and defaults to deepseek-v4-flash. OPENSEEK_MAX_STEPS is optional; when omitted, turns are bounded by the model's context window (a checkpoint summary carries each turn into the next) rather than a step count. Pass --max-steps to cap steps for one run. --thinking no|high|max controls thinking mode and effort (default: high); GLM maps no to its lowest supported effort because GLM 5.3 always reasons. Pass --dir <workspace> to run one-shot commands against another workspace while still launching from the current shell. The default is .; if the final directory component is missing and its parent exists, OpenSeek creates it and logs workspace_created.

#MCP Servers

OpenSeek can use tools from MCP servers. Point --mcp-config (or OPENSEEK_MCP_CONFIG) at a JSON file in the de-facto standard shape — an existing Claude/Cursor-style mcp.json works as-is:

{
  "mcpServers": {
    "codex": { "command": "codex", "args": ["mcp-server"] },
    "remote": { "url": "https://example.com/mcp", "headers": { "Authorization": "Bearer …" } }
  }
}

A command entry is launched as a stdio subprocess (in the agent's workspace, inheriting the environment plus any env overrides); a url entry speaks the Streamable HTTP transport. Each server's tools join the agent's registry as mcp__<server>__<tool> for run, serve, and the TUI (which forwards OPENSEEK_MCP_CONFIG to its engine). A server that fails to start, handshake, or list its tools is logged and skipped — MCP never breaks a session. Tool results are size-capped, calls are bounded by a timeout, and tool names are sanitized to the provider's function-name rules.

Validate a configuration without starting a session:

moon run cmd/openseek -- mcp --mcp-config mcp.json

Resources and prompts (the other MCP capabilities) are not consumed: openseek's agent is tool-driven, and a server that wants to feed it context can expose a tool. This keeps the surface small; revisit if a concrete need appears.

#Skills

Reusable markdown playbooks the agent loads on demand. A skill is a <name>.md file or a <name>/SKILL.md directory layout with optional name:/description: frontmatter. Two libraries are merged: the global one (~/.openseek/skills, or --global-skills-dir) and the workspace one (.openseek/skills), with workspace skills shadowing same-named global ones. The system prompt lists each skill's name, description, and file path; the agent reads the file before applying it. See agent_skill/README.mbt.md.

#Terminal UI

The interactive terminal UI is the openseek_tui binary, maintained in its own repository: moonbitlang/openseek_tui. It depends on this module (bobzhang/openseek on mooncakes) for the agent, session, and provider packages, and spawns the openseek engine built here in serve mode. Its sessions are interoperable with the CLI's: moon run cmd/openseek -- sessionslist shows what is resumable from either.

See each package README for API boundaries, examples, and package-specific test notes.

#Verified CLI Documentation (cram)

The CLI behaviour is documented as executable cram tests under tests/, built and run with moon cram test. The wrapper compiles the native cmd/* packages and exposes each on PATH as <name>.exe (e.g. openseek.exe).

tests/cram/cli.md — offline openseek subcommand examples (top-level and run help, and the run/serve/sessions behaviors). They make no network calls and run in CI via moon cram test tests/cram.
tests/cram/subrun.md — the offline internal child-mode wire contract: JSON input on stdin, JSONL events on stdout, typed reports, and failure-event delivery. It uses the modelless echo kind and needs no API key.
tests/live/deepseek.md — a real, non-mock DeepSeek round trip. It is opt-in (DEEPSEEK=sk-... moon cram test tests/live) and parses the agent's JSONL log with MoonBit itself: a moon run -e script reads the stream through the published bobzhang/jsonl package and asserts on typed Json values — no jq — without pinning nondeterministic content such as token counts or model phrasing.

For the evaluation-backed roadmap, see agent-improvement-guide.md. It explains why the next highest-ROI work is semantic CLI validation, native CLI/error-handling guidance, MoonBit command routing, shaped IDE output, and manifest/debug/edit guardrails.

The file-editing eval harness is available under eval/file_edit. It runs the real agent against isolated fixtures and checks exact final file state, making it suitable for cheap Flash baselines such as 8 successful edits out of 10.

The deterministic tool harness under eval/tool_harness exercises each built-in tool through agent_tool.execute_tool_call with temporary fixtures. It is meant for ordinary moon test coverage of tool wiring and observable side effects, not for model quality scoring.

The testkit/filesystem package provides reusable JSON-backed text fixtures for mock tests and evals. It materializes flat path-to-content JSON objects under a temporary root and compares listed files against disk.

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