Fx v0.0.8

fx is smaller, simpler, and faster. libfx initialization in Node / browser is over 40× faster; fx binary is 7.49% smaller. fx uses a smaller three-action shell, context compaction is optimized per model, and Enter steers active turns instead of queuing follow-ups.

Breaking Changes

• fx now uses a smaller shell tool with 75% fewer actions (3 vs 12), replacing the old terminal tool.
• Enter now steers active turns instead of queuing follow-ups, and ctrl+enter does the same.
• The subagent interface now has 67% fewer commands (2 vs 6), with direct delegation replacing the ctrl+x manager.
• The memory tool has been removed without deleting existing saved memories.
• createFxAgent() now exposes prompt, checkpoint, and close instead of the old session, model, and config APIs.
• createFxAgent() now takes apiKey and an optional model directly; Agent configuration through env is no longer accepted.
• capability_search replaces the retired skill_search and mcp_search_tools.
• The public --record startup flag has been removed.

New Features

• Compaction now keeps recent tool exchanges intact, preserves the full transcript, and continues the same turn in a fresh context window.

• fx can run one-off tasks or continue named agents directly from the conversation.

• The shell now supports up to 64 live executions.

• /mcp now opens a terminal browser for servers, tools, resources, prompts, authentication, and project trust.

• MCP tool images now reach supported models and remain available after resume.

• JavaScript hosts can now add their own tools, MCP clients, and skills across Node, Bun, and browsers.

• The libfx package has no runtime dependencies; host-supplied tools and MCP clients may have their own.

• ACP image prompts now support up to 3.75 MiB per image.

• /provider, /setup, and /login now open the same column picker for providers, sign-in methods, API keys, and Vercel teams.

• libfx now provides listModels() for explicit model discovery without creating an Agent.

• Embedding hosts can use FX_AUTH_MODE=host-managed without reading or writing local provider credentials.

• --full-access and /permissions full-access replace YOLO in the UI and commands; the old aliases still work.

• fx ask --json now reports input and output tokens.

• libfx now supports both ESM imports and CommonJS require() in Node.

• Native libfx Agents now run in Next.js 15 and 16 server routes without extra bundler configuration.

• getBackendInfo() now reports available libfx backends and loading errors without creating an Agent.

• fx session recover <id> can recover damaged conversations into a new session while leaving the original intact.

Improvements

• Native Agent initialization is tens of times faster, dropping from hundreds of milliseconds to single digits.

• Native streaming no longer waits on the polling bridge.

• Synthetic native host-tool round trips measured 3.10 ms in Node and 1.56 ms in Bun at p95.

• In the current benchmark, all 22 measured TUI interactions complete within 15 ms at p95 across 50 samples each.

• CLI startup now takes about 0.5 ms before terminal initialization.

• ctrl+o now shows timestamps, complete tool details, errors, and per-turn token usage in one view.

• Skill and MCP searches now reject weak matches while preserving exact names and technical terms.

• AI Gateway now uses Exa by default for web searches, with Parallel as the fallback.

• AI Gateway caching is now enabled automatically for agent conversations.

• New sessions use shorter 12-character IDs while existing IDs remain resumable.

• File and model pickers remain available while fx is working, and model changes apply to the next turn.

• Steering messages now appear in chat immediately and wait only while a tool is running.

• Codex and Grok model lists refresh in open terminal and ACP sessions without requiring their CLIs.

• Stable Wasm sources compile once per JavaScript realm while each Agent keeps separate state and memory.

• MCP servers now connect independently, and optional servers start only when needed.

• Subagent tasks and replies now appear in chat, with failures and partial results preserved.

• The /resume picker now reuses cached session summaries instead of rescanning every time.

• Terminal tabs now show the fx version and workspace folder.

• libfx now pauses large streams when hosts fall behind instead of losing output.

• ctrl+c now clears the composer first and cancels active work only when the composer is empty.

• Long saved conversations now resume faster, including repeated fx -c continuation.

• Scoped project instructions now refresh before continued turns, including rules changed since the last tool call.

Bug Fixes

• Models with native image support no longer receive the redundant vision tool.

• Terminal fx ask now loads approved MCP servers before the first model request.

• The footer now shows Fast mode only when it matches the active model.

• fx now keeps replies in the language of the latest user request.

• AI Gateway requests can run for up to 30 minutes, and timed-out streams pause instead of retrying automatically.

• Partial command output and known process status are preserved when output reading fails.

• Forced shell termination now stops waiting after 6 seconds and reports when termination cannot be confirmed.

• Tools that fail before execution now show why they did not run.

• Cancelling an ACP prompt now stops the work instead of leaving it running.

• Gateway, Codex, and Grok no longer fall back to another credential source when the selected one is unavailable.

• New sessions remain saved when another fx process is updating session history.

• Older sessions now upgrade without losing conversation history or tool output.

• Explicitly requested skills now load completely and show their status before the reply begins.

• Cancellation feedback now appears immediately after esc, while completed tool results remain intact.

• Invalid shell requests now explain the argument problem and suggest a correction only when the repair is unambiguous.

• Recovered responses no longer join text from separate attempts or repeat completed tool calls.

• Provider selection remains responsive while credentials and models load, and sign-in can resume after logout, cancellation, or credential failures.

• Large session reads no longer block concurrent saves.

• Cancelled libfx prompts stop waiting on host tools and cannot affect later turns.

• Native streaming preserves Unicode split across output chunks and continues after delayed cleanup.

• Closed libfx Agents now release native threads, notification descriptors, and Wasm instances.

• Pending MCP authentication no longer blocks a newer reload.

• ctrl+o history now survives ctrl+l, terminal resizing, reopening, compaction, and resume without missing or duplicate entries.

• Provider streams and parallel tool calls no longer lose or duplicate text, reasoning, and tool results.

• Prompt images now survive tool calls and resume without falsely exhausting context.

• Image recovery now uses saved attachments after restart, even if the original files move or change.

• Missing or corrupt saved images now report an error without discarding the pending request.

• Manual compaction now refreshes the selected login and keeps the conversation unchanged if sign-in fails.

• Cancelled tools no longer prevent manual or automatic compaction, including after resume.

• Long reasoning sessions no longer hit false context limits or leave too little room for compaction.

• fx -c now skips incomplete sessions and reports errors for the selected session instead of opening an older conversation.

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