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Answers hard questions by staging a formal debate: two adversarial subagents argue opposite sides with research, then the main agent rules on the transcript through the debate_open, debate_round, and debate_verdict tools.

Economic indicator lookup via World Bank open data (GDP, inflation, trade, population), no API key required.

Economics-first journal/working-paper monitor for DeepSeek Harness: NBER RSS + arXiv econ (4 categories) + Chinese econ journals (Shi Jie Jing Ji via Magtech, Zhong Guo Nong Cun Guan Cha, Cai Mao Jing Ji, Zhong Guo Ren Kou Ke Xue, Jing Ji Guan Li via ajcass) fetch, keyword filter, dry-run/Webhook push, dedup persistence, and schedule_create-compatible briefing.

A @-file reference tool for DSH: registers an at_file_read tool that injects workspace-file contents into the session, with traversal protection and a 50KB truncation cap (MIT).

Ask-before-act approval for every edit and every bash command: a red/green line diff before a file is touched, a description+command panel before a command runs — approve once or reject, each gate with its own master switch in Settings → General.

A `search` tool that learns to pick between fast and thorough search strategies using a contextual bandit (Thompson sampling), improving from real usage instead of a fixed heuristic.

DSH↔Godot engine runtime bridge: launch and drive a running Godot 4.x game through its in-game TCP interaction server — 16 tools (runtime control via ~130 game commands, scene/UI inspection, GDScript eval, input simulation, screenshots, headless static ops, project editing, export, script validation, engine-path setup), replaces godot-mcp.

Multi-workspace sandbox: grants file-write access to every registered workspace automatically — add a workspace, write to it immediately, no config or escalation needed.

OAuth 2.1 MCP client for Streamable HTTP servers: add a connection in Settings, sign in through the browser (PKCE with dynamic client registration), and have its tools registered in DSH, with tokens kept in the credential service and the connection written to the profile.

Codex-backed `web_search`, `image_gen`, and `image_vision` tools for DeepSeek Harness, reusing ChatGPT OAuth login state.

CalDAV calendar tools (list/create/update/delete/search/health) for Google/iCloud/Nextcloud/custom endpoints, with RRULE expansion.

Citation tools for agents: exact DOI lookup, Crossref bibliographic search, GB/T 7714 / APA / MLA / Chicago formatting, BibTeX generation, bounded-concurrency DOI validation and health self-check.

Batch-port official Codex plugins into DSH skills (codex_list/port/status/health; measured: 186 plugins / 583 skills, 577 ported, 0 failures).

Docker tools for agents: ps/images/logs/inspect/exec/manage/health with JSON output, env-configurable CLI path, approval-gated exec and zero runtime dependencies.

Ten video tools (probe/cut/concat/encode/subtitle/extract/gif/frames/adjust/health) on the official subprocess service: probe summaries, batch frame extraction, speed/volume/mute/rotate adjust, shell-free argv, zero runtime dependencies.

RSS/Atom subscription tools (list/add/remove/fetch/check/search/opml_import/opml_export/health) with cross-feed keyword search, cursor-based incremental fetch and OPML import/export, persisted to settings.

Database tools for agents: list/query/exec/schema/stats/health across SQLite/MySQL/PostgreSQL, with lexer-grade read-only protection, row caps, CSV/JSON query output and an approval-gated write path.

ROS2 debugging toolset and robot-state vision analysis for DeepSeek Harness: node/topic/service/action/interface/TF enumeration, whole-graph topology JSON, rosdep checks, approval-gated builds and custom message scaffolding, GUI screenshots and multimodal vision observation, plus headless RViz2 offscreen rendering (low-poly meshes, direct pixel read, GPU passthrough - motion rendering at 30Hz) with parallel VLM realtime analysis.

A-share market dashboard: realtime indices and quotes, market sentiment thermometer (up/down breadth, limit-up/limit-down/broken counts, consecutive-board ladder, limit-up pool), THS-style stock detail popups with candlestick K-line (forward-adjusted, MA5/10/20, volume, crosshair), persistent watchlist with realtime quotes, grouping and JSON/CSV import-export, ETF/convertible-bond/LOF boards, dual-mode screener (weighted signal score + 7-preset multi-strategy intersection), and a tri-source 7x24 news feed (Sina/Eastmoney/Jin10) with important-item highlighting.

Tool catalog for agents: search ~2,600 external endpoints (SEO and SERP, backlinks, social, people and company enrichment, ad libraries, scraping) by the task you want done, read each one's parameters and per-call price, then call it with the credential injected server-side. Ships the skill plus an MCP row that stays disabled until TREG_TOKEN is set.

Observational file-mutation rollback for the fs tools: write/edit pre-images are checkpointed as git blobs or snapshots and restored through a model-facing rollback_files tool or a /rollback command.

Fine-grained LLM verification for DSH agents: pairwise rewards over score-token logprobs, Probabilistic Pivot Tournament best-of-N selection, and per-step progress tracking.

Unified search with evidence verification for agents: 120+ engines with multilingual routing, vertical domains and structured modality cards, 10 MCP tools plus wide_research orchestration, and a fetch-verify loop that backfills evidence scores.

Minimal snippet and command toolbox for DSH: five tools over a single human-editable JSONL file, zero UI, zero database, zero network, explicit save-only memory.