Mastra is a framework for building AI-powered applications and agents with a modern TypeScript stack.

Model-facing web tools (web_search, web_fetch) over the DeepSeek Harness web capability seam (ctx.web)

Tool for transforming styles with JS plugins

Bundled dsh badge skill provider for DeepSeek Harness

Zero-dependency no-shell execFile runner for host-native OS integrations: utf8 stdio capture, abort propagation, Windows hide

Abstract workspace-directory picking seam (ctx.directoryPicker) for the DeepSeek Harness web GUI host

Child-scoped report tool over ctx.subagents continuations

Model-facing subagent delegation tool over the ctx.subagents seam

Native-OS-chooser backend of the directory-picker seam for the DeepSeek Harness web GUI host

Token-meter-driven compaction policy and LLM summarization backend for the DeepSeek Harness

Abstract spill storage seam (ctx.spillStore) for the DeepSeek Harness — save oversized tool text and return a retrieval locator

Repeat-tool-call guard plugin: advisory reminders when an agent loops on identical tool calls

In-app browsing backend of the directory-picker seam (listing/creation primitives over the host filesystem)

Local filesystem skill provider for the DeepSeek Harness

Azure AI Projects client library.

Globally named send_message, interrupt_agent, and list_agents tools over ctx.subagents continuations

The shared dsh core as a profile bundle: every profile's first patch layer, inserting the base plugin rows over the empty profile root

Model-facing workflow tool: run a JavaScript orchestration script over ctx.workflows

Model-facing fresh-agent Ralph loop over the workflow and subagent seams

Sandbox-consuming implementation of the DeepSeek Harness PowerShell executor seam (confines every command via ctx.sandbox, reports denial/enforcement result facts)