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A session mode is a named, logged, per-agent policy state: mode/set as a log-only SessionEventMap member (todo/write shape), a foldMode over the log, soft enforcement at system-prompt/assemble (filtered schemas + mode section, auto-logged as request/header-delta), hard enforcement at tools/pre-execute (deny-by-default against the mode allowlist), and a thin ctx.modes service with turn-boundary pending-intent flush for user flips. One new product package dsh-mode (packages/mode/mode, the approval-group shape); plan is the only shipped definition. Lands as ONE feature — a plan mode without a model-driven, approvable exit is not a smaller version of the feature. The roadmap's two stages are build-and- review order for a single stacked landing: the mode core, then exit_plan_mode (ask-gated through the approval seam; the plan text rides the tool args as the reviewable log artifact), the stdio readline answerer, and the ACP session-mode surface (session/set_mode, current_mode_update, available modes). Hard prerequisite: the approval seam lands first; the stack bases on feat/sandbox-support meanwhile.
DeepSeek Harness
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The DeepSeek Harness SDK is a plugin-based SDK for building agent harnesses.
Development
This monorepo is built on the Cordis framework (vendored as source under vendor/), microkernel-style: everything is a plugin.
pnpm install
pnpm run test # vitest
pnpm run demo:repl # REPL agent demo (needs DEEPSEEK_API_KEY)
pnpm run demo:acp # ACP server agent demo (needs DEEPSEEK_API_KEY)
For humans, start with the development guide for local setup, hooks, environment variables, and quality gates, then read the architecture design and documentation graph index before package work. Local context lives in packages/ and vendor/.
For agents, follow AGENTS.md.