Mark Xian xianjianlf2

About

I'm an AI product engineer in Guangdong, China, building agentic canvases, document intelligence, and developer tools. I work where product taste, interaction design, and engineering depth meet—reducing ambiguity and shipping the details that make a product hold together.

Make AI feel useful.

Current inquiry: how AI agents can work with visual canvases instead of only replying in chat.

Now building

Inkling · Agent-native visual thinking

Inkling is an AI mind-mapping canvas. Muse reads your PDFs and draws editable maps live—skeleton first, details grafting in—then sees the nodes you edit by hand and builds on those changes instead of regenerating the whole map.

React · Hono · Vercel AI SDK · AntV X6

Join the private beta →

Selected work

🧠 MindGeniusAI

Self-hostable AI agent that turns PDFs into editable mind maps with visible tool calls and built-in RAG.

React Hono Vercel AI SDK

🎨 gpt-image-2-tools

Client-side, BYOK image playground for generation, editing, inpainting, and voice control.

Astro React BYOK

Repository ↗ · Live ↗

🔌 apidoc2MCP

Turns OpenAPI, Swagger, Markdown, and HTML docs into MCP service definitions.

Python TypeScript MCP

Repository ↗

_{Earlier work: vue3-pdf-viewer / @xianjianlf2/vue-pdf-viewer, an archived PDF.js viewer for Vue 3.}

Open-source activity

I work upstream in the active projects I use—especially agent runtimes, developer tools, and infrastructure. The visible rows surface current high-signal work; the expandable list keeps a representative activity trail. Browse the live list of open pull requests →

In flight

Project	Current contribution
orca	Avoid empty tabs for session metadata
Sequelize	Keep `USING` out of `COMMENT ON COLUMN` when altering ENUM · Close connections after setup failures
Redux Toolkit	Skip fetch when an infinite-query trigger uses `skipToken`
Mac-Duo	Add opt-in external displays that follow the MacBook lid
filetype.py	Use registered font media types
zerolog	Write CEE syslog messages as a single record

More active upstream work

Project	Current contribution
picomatch	Treat unmatched double quotes as literal path characters
neoformat	Find local Node formatters from the buffer directory
Flutter	Replay predictive back state for retained engines
Sequelize	Close connections after setup failures · Keep USING clause out of COMMENT ON COLUMN when altering ENUM
Anthropic SDK for TypeScript	Prevent retries with streaming request bodies
Cherry Studio	Align pi endpoint injection resolver
Agno	Route HTML URLs through WebsiteReader · Make message content stringification trace-safe · Support Cosmos MongoDB search options · Normalize AgentOS model providers · Scope entity memory IDs by user
magicast	Preserve tab indentation when modifying modules
stablyai/orca	Report the current terminal surface · Expose SSH hosts running agent hooks · Label hosted reviews by provider · Mark node-pty master fds close-on-exec · Stop stale merged-PR flashes · Report terminal wait observed state · Open files in the default app · Expose task worktree provenance · Prune hydrated restored folder owners · Avoid empty tabs for session metadata · Move the relay CLI bin dir to the front of PATH · Load PR tree-selected sections · Report multiplex slot diagnostics · Render `<br>` in markdown table cells as line breaks
Firecrawl AnyDoc	Expose slide boundary anchors for presentations · Support standalone HTML documents
cmux	Fix optional-guarded custom-sidebar views · Document OAuth tokens for concurrent Claude Code sessions
Block Buzz	Preserve agent profile fields when setting policy
AIRI	Restore an off-screen desktop main window
n8n AI Agent Security Lab	Add a broad AI HTTP tool fixture
context-mode	Evict least-important events first
mathjs	Round zeta BigNumber digit count
Joi	Ignore internal references when ordering object keys
memfs	Close the original descriptor after stream release · Align runtime dependencies with published entry points
Beanie	Preserve custom document IDs in inspection errors
Vite	Skip glob transforms when only the query string varies
MLflow	Add GitHub Copilot SDK tracing integration
MCP TypeScript SDK	Decode URI template match values
LangChain.js	Support HITL respond decisions · Preserve audio in Responses input · Preserve Perplexity chat completion token usage
Anthropic SDK for Python	Wrap mid-stream transport errors
Vercel AI SDK	Add LangChain message-history hydration helpers
LiteLLM	Include annotation page costs · Hold fallback lifecycle frames
Fastify JWT	Honor per-request key overrides
MCP Seatbelt	Add an upstream health endpoint
TanStack Router	Preserve encoded slashes in splat params · Avoid repeated React Navigate rerenders · Respect `wrapInSuspense` in Solid Router
Maestro	Reuse hierarchy on lookup failures
OpenSpec	Address DSH review follow-ups
OpenMausBot	Fix DSH retired Host turn fences
codeburn	Guard DSH zstd support on older Node
superstruct	Preserve input coercion when merging structs
browser-use	Return errors for stale click and dropdown actions
Kimi Code	Restore the VS Code todo-list card · Fix code-workspace path escape errors · Sanitize download filenames · Parse byte ranges strictly
Quilt	Publish Windows x86_64 quilt-cli binaries
afero	Honor access mode in MemMapFs.OpenFile permission checks · Check source existence before a no-op MemMapFs rename
Hono	Preserve repeated form fields in method override · Preserve commas within quoted entity tags
Handlebars	Retain helpers for precompiled partial runtimes
superjson	Document binary data support
deep-eql	Compare URLSearchParams by their query strings
TanStack Form	Keep the `reset(values)` baseline on update · Clear stale linked-field validation errors · Create complete field meta for uninitialized fields
Drizzle ORM	Fix relation-name collision with inherited keys · Preserve Unicode identifiers in casing helpers · Preserve custom codecs for aggregate functions
fast-check	Allow sync beforeEach hooks for async properties
GoogleChrome/webstatus.dev	Clarify browser availability in WPT cards
class-transformer	Preserve readonly array overloads
sktime	Replace sklearn grid search with native evaluate

_{Curated snapshot checked on 22 Sep 2026; the live GitHub query above is the source of truth.}

Recently merged

Project	Merged contribution
async	Propagate async iterator errors from tryEach · Clear timeout before invoking the callback
pydash	Support iterator inputs in intersection helpers
arktype	Prevent crashes validating unions of object arrays · Fix recursive aliases with `Record` references
node-fs-extra	Propagate `emptyDir` directory read errors
GitHub Spec Kit	Warn when feature names have an empty suffix
perm-gate	Add an optional live LLM baseline
type-fest	Add `UnionMax` type
Heroic Games Launcher	Keep library entries when GamesDB is unavailable
chroma.js	Keep alpha when constructing from an object · Name rgb2hsv converter correctly · Reject non-numeric channels · Update automatic classes when the domain changes · Clarify Lab and Lch round trips
p-event	Reject pending iterator reads when resolution filters fail

More merged work

Project	Merged contribution
Chai	Preserve literal template tags in assertion values
p-throttle	Respect future weighted throttle reservations
p-timeout	Handle input rejections when already aborted
p-debounce	Preserve falsy promise rejection reasons
niuu	Fix Prettier drift
claude-mem	Fix transcript watcher durable offset commits
Unplug	Align security claims with implementation
cc-switch	Fix DeepSeek Harness review issues
Quilt	Stop the status walk from waking the watcher that triggered it · Share S3 clients across cloned remote handles · Flush the log tail before Tauri exits · Infer namespace from the working directory · Default home directory on first use · Keep tracing logs off stdout by default · Add `quilt log`, listing copy revisions · Add reset command for local-only packages · Treat rejected credentials as dead sessions · Add `--json` output and non-zero failures · Run fork pull requests with credential-free CI
Okto Nexus	Restore and document the live MCP smoke test
Anomalithic	Preserve stream finish reasons
Qwen Code	Report compression API failures distinctly · Scope startup warnings to development sessions
GitHub Copilot SDK	Serialize concurrent Python and Node.js client startup · Isolate GitHub token callbacks from request routing · Support bracketed IPv6 runtime URLs
ARGUS	Remove unreachable LLM modules · Grade and report the exact check run
streamcore-server	Make the OpenAI transcription model configurable
reticle	Harden MCP proxy POST transport against socket exhaustion
sysknife	Keep provider keys out of VM process arguments
ship-safe	Detect unpinned AI actions
OpenAgent Eval	Add offline testing workflow · Add a zero-key quickstart
py-harness	Clarify cross-platform first run
EvalRepro	Add Windows development setup commands
Agent of Empires	Preserve UTF-8 names when stopping sessions
homelab-monitor	Centralize Python dependency management
NimbleBrain	Extend LLM latency histogram tail · Keep the worktree seed schema-valid
hflow	Constrain hand-count evaluation schema · Make judgment outcomes exclusive
localvectordb	Reject MCP database lifecycle no-ops
molecare-skin-llm	Make local checkout paths portable
Context Passport Python	Validate passport event types against the v2 schema
Context Passport TypeScript	Validate passport event types against the v2 schema
agent-me	Sync localized document metadata
kareya	Add an OpenAI-compatible content provider
stablyai/orca	Post POSIX agent-hook payloads as JSON
llmtrim	Fix explicit DSH shim path resolution
parsar	Bump Go patch version for govulncheck
PapaParse	Apply `transformHeader` only once per header
DingTalk Workspace CLI	Align DSH skill root handling
Fastify HTTP Proxy	Scope WebSocket upgrades to the proxy prefix
Karabiner-Elements	Add default mouse modification setting · Add ctrl-click to command-click example · Add notification window position setting · Add duration to notification messages
AIRI	Fix DeepSeek provider instance settings · Add DeepSeek thinking mode toggle
Effect	Preserve JSON.rawJSON in cached OpenAPI specs · Return fresh cached specs from OpenAPI · Stringify bigint values in JSON diagnostics
VidBee	Keep external download path in portable mode
Calico	Expose server write timeout configuration · Re-advertise service external IPs from route reflectors

Learning in public

I rebuild familiar tools—and now agent runtimes—from scratch to understand the decisions beneath their APIs. Each project develops one system incrementally, commit by commit.

super-agent · Tool-using agents, chapter by chapter

A branch-by-branch study of streaming, tool calling, MCP clients, deferred tool loading, session persistence, and context compaction.

TypeScript · Vercel AI SDK v6 · Qwen · MCP

Explore the 6-project mini-* source-code series

Project	Systems explored
mini-vue	Reactivity, virtual DOM diffing, template compilation, lifecycle hooks
mini-koa	Middleware composition, onion model, context, router layering
mini-react	Fiber, reconciliation, `useState`, `useEffect`
mini-webpack	Module bundling, dependency graphs, loaders, plugins
mini-compiler	Tokenization, parsing, AST traversal, code generation
ts-axios	Interceptors, config merging, data transforms, cancellation, and other HTTP-client internals

Toolbox

Have an interesting product idea or open-source problem?
See what I've shipped · GitHub activity · Juejin · Say hello

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