parlant releases

[3.3.2] - 2026-04-28

Added

• Add PARLANT_TOOL_CALL_TIMEOUT environment variable to control the plugin tool-call timeout

Changed

• Include guideline description (in addition to the condition) in matcher prompts
• Render active journeys' descriptions in the canned response draft prompt
• Improve error messages surfaced by EmcieService to be more diagnostic
• Relax the aiopenapi3 pin to >=0.8.1,<0.9.0

Fixed

• Fix redundant batch creation in ToolCaller across guideline matches, which in some agents caused a lot of latency unnecessarily
• Fix WebSocketLogger event loop starvation which progressively blocked the async event loop, causing increasing latency over time
• Fix p.Server.current becoming unavailable in the resolve_tool plugin endpoint under Uvicorn 0.39+. Context vars are now restored at the start of resolve_tool, mirroring the existing pattern in call_tool, so choice providers depending on p.Server.current work again
• Fix MCP tool clients getting stuck after sessions go stale. Clients now reconnect automatically instead of failing subsequent calls

Security

• Upgrade dependencies to address known CVEs: authlib (>=1.6.11), requests (>=2.33.0), fastmcp (>=3.2.0), litellm (>=1.83.0), pytest (>=9.0.3), pyjwt (>=2.11.1), and constrain transitive deps — aiohttp, cryptography, pillow, pyopenssl, werkzeug, Mako, pyasn1, python-multipart, orjson, Pygments, diskcache
• Upgrade chat frontend: vite (>=7.3.2) and override transitive deps: picomatch, lodash, flatted, brace-expansion, immutable, yaml

[3.2.1] - 2026-02-17

Added

• Add optional dependencies parameter to guideline, observation, and journey creation methods
• Add exclude() as an alias for prioritize_over() on guidelines and journeys
• Add tools parameter to create_observation methods

Changed

• Deprecate attach_tool() in favor of create_guideline()/create_observation() with tools parameter

Fixed

• Preserve draft message language during canned response recomposition
• Fix server hang when an exception occurs during setup
• Fix canned response field extraction to handle falsy values

[3.2.0] - 2026-02-09

Added

• Add labels to Guidelines, Journeys, JourneyNodes, and Sessions for categorization and filtering
• Add automatic session label propagation from matched entities (guidelines, observations, journeys)
• Add track parameter to guidelines to control "previously applied" tracking
• Support multiple targets in prioritize_over() and depend_on() methods
• Add field_dependencies to canned responses for explicit field availability requirements
• Add attach_retriever() to Guideline, Journey, and JourneyState for conditional data retrieval
• Add on_match and on_message hooks to journeys for lifecycle callbacks
• Add per-agent preamble configuration (custom examples and instructions)
• Add separate default greeting responses for first agent message in fluid mode
• Add streaming message output mode
• Allow specifying custom journey node ID
• Add matched guidelines/journey states to completion ready event

Changed

• Make condition optional for SDK guidelines
• Tweak default preamble examples
• Soften log levels for relational guideline resolver
• Add activated/skipped logs to custom guideline matcher batches

Fixed

• Fix websocket warning upon startup
• Fix agent intention proposer (guidelines were getting rewritten incorrectly)
• Fix multiple customer guideline matchers not working
• Fix bug with context variable access in SDK