## DeepSeek++ (zhu1090093659/deepseek-pp) — Investigation Summary ### What it is **DeepSeek++** is an open-source browser extension (Chrome, Edge, Firefox) that turns the DeepSeek web app (chat.deepseek.com) into a full **AI agent workspace** — adding persistent memory, reusable Skills, system-prompt presets, MCP tool execution, browser control, web search, conversation export, scheduled automation, and multimodal media analysis. Crucially, it does this **without needing API access**: it intercepts the DeepSeek SSE response stream in real time to execute tool calls transparently, giving the web app agent-like behavior. All data is stored locally in the browser unless the user explicitly enables WebDAV sync or connects their own MCP endpoints. ([GitHub repo](https://github.com/zhu1090093659/deepseek-pp), [README](https://github.com/zhu1090093659/deepseek-pp/blob/main/README.md), [Chrome Web Store](https://chromewebstore.google.com/detail/deepseek++/kdmpkkahkhdmdhfkdihkopikgcocbpbf)) ### Recent releases (v1.12.x — shipped Aug 3–4, 2026) The latest release is **v1.12.2** (Aug 4, 2026), a "tool-execution transparency & production-experience" release: - **v1.12.2**: Failed tools (e.g. `shell_exec`) now show the actual command and failure reason; authorization denials show specific causes; a new "Export diagnostic logs" button in Settings; long outputs auto-save as downloadable artifacts; a "Copy full output" button; conversation export now lets you choose scope ("inputs + outputs only" vs "everything"); more accurate inline-agent continuation counts. No new browser permissions. ([Releases](https://github.com/zhu1090093659/deepseek-pp/releases)) - **v1.12.1**: Deterministic auto-continue for reading large local files (no more silent truncation of CJK/emoji text, no OOM on huge files); a Firefox toolbar button; scrollable sidebar tabs; clearer inline-agent step timeline; simplified tool execution (enabled tools run automatically); MCP/sandbox hardening. ([Releases](https://github.com/zhu1090093659/deepseek-pp/releases)) - **v1.12.0**: Structured agent-step UI with a global running indicator and bounded retries; native-search coordination (no duplicate web search); a new "trusted directory" + **@ file references** feature; image MIME normalization; token-trend chart fix; MCP compatibility improvements. ([Releases](https://github.com/zhu1090093659/deepseek-pp/releases)) ### The most recent development (Aug 5, 2026 — on `main`) The newest work is an architectural refactor of the **inline agent** around a new **`pi-agent-core`** with a **`pi-ai provider`** abstraction that supports **dual backends**: - **Step B1** — a `deepseek-web` provider (the web interface) - **Step B2** — an `official-api` provider (the official DeepSeek API) Commits like `feat(inline-agent): official-api dual backend wiring (B2-T5/T6)`, `feat(inline-agent): deepseek-web pi-ai provider registration (B1-T3/T4)`, and governance docs (`AGENTS.md` "dual-backend single authority stable rule") show this is being built in staged, tested batches (T1/T2 contracts → T3/T4 provider registration → T5/T6 loop wiring). ([Commits](https://github.com/zhu1090093659/deepseek-pp/commits/main)) ### Why it matters 1. **Popular and actively maintained**: ~1.5k GitHub stars, 186 forks, ~5,000 Chrome Web Store users, rated **4.9/5** (15 ratings), with the latest release and commits from the last 24 hours. ([GitHub repo](https://github.com/zhu1090093659/deepseek-pp), [Chrome Web Store](https://chromewebstore.google.com/detail/deepseek++/kdmpkkahkhdmdhfkdihkopikgcocbpbf)) 2. **A notable "no-API" agent pattern**: it demonstrates turning a hosted AI web app into an agent workspace by intercepting the SSE stream — a local-first approach that avoids API costs/keys while adding memory, MCP, and automation. ([AgentIndex](https://agentindex.app/en/tool/zhu1090093659-deepseek-pp/)) 3. **The dual-backend architecture is the key forward-looking change**: letting the inline agent run on either the web login *or* an official API key makes the agent more flexible and portable, and the staged, tested rollout (contract → provider → wiring) signals a maturing codebase. 4. **Privacy posture**: no backend service stores extension data; everything is local unless the user opts into WebDAV sync or their own MCP endpoints, and recent releases explicitly add **no new browser permissions**. ([Chrome Web Store](https://chromewebstore.google.com/detail/deepseek++/kdmpkkahkhdmdhfkdihkopikgcocbpbf)) ### Strongest sources (all opened) - [GitHub repository](https://github.com/zhu1090093659/deepseek-pp) — project overview, stars/forks - [Releases page](https://github.com/zhu1090093659/deepseek-pp/releases) — detailed v1.12.0/1.12.1/1.12.2 changelogs - [Commits page](https://github.com/zhu1090093659/deepseek-pp/commits/main) — the B1/B2 dual-backend inline-agent work - [README.md](https://github.com/zhu1090093659/deepseek-pp/blob/main/README.md) — full feature/positioning documentation - [Chrome Web Store listing](https://chromewebstore.google.com/detail/deepseek++/kdmpkkahkhdmdhfkdihkopikgcocbpbf) — user count, rating, privacy disclosure - [AgentIndex profile](https://agentindex.app/en/tool/zhu1090093659-deepseek-pp/) — third-party categorization and traction data