Posts in the AI Framework Changelog series
Mastra 1.59.0 highlights: (1) CostGuardProcessor renamed and upgraded to TokenCostControl, now supporting user/organization/session tiered budgets with warnAtPercent alerts; (2) Breaking: Factory's autoRunEnabled now defaults to false — rule-suggested executions enter a proposed state pending approval; (3) New listActiveThreadRuns() for low-cost querying of in-progress runs, enabling status-polling UIs.
AG2 v1.0.2 highlights: (1) AG2 agents can now be exposed as ACP agents, serving remote clients over HTTP/WebSocket; (2) A2A agent cards switch from plaintext to signed-and-verified, plus gRPC TLS transport; (3) LiveAgent adds ElevenLabs as a voice provider, and community extensions (Tenki sandbox, TealTiger governance middleware) land for the first time. No breaking changes.
Mastra 1.60.0 highlights: (1) Stored Agents gain durable: true for durable execution without redeployment, inheriting the server's cache/pubsub for multi-replica persistence; (2) new @mastra/cloudflare-sandbox provider executes commands and file operations through a deployed Sandbox Bridge Worker; (3) @mastra/mcp supports the stateless 2026-07-28 MCP protocol revision and multi-turn elicitation. No breaking changes.
CrewAI 1.15.17 highlights: (1) declarative Flow definitions can now enable conversational mode — the framework auto-synthesizes built-in conversation methods, no Python `Flow` subclass required; (2) conversational mode is explicitly marked as opt-in to reduce misuse risk; (3) fixes for AMP slug loss during slug-reference tool resolution and chunking of oversized single messages. No breaking changes.
Agno 3.0 in three points: (1) Runs table restructuring — runs move from session JSON blobs into a dedicated agno_runs table, reducing write amplification from O(N²) to O(N); you must run MigrationManager before upgrading or you'll hit MigrationRequiredError; (2) New Tool Result Offloading and Media Offloading — tool results over 16,000 characters and images/audio/video get moved to AgentFS or S3, leaving only a slim envelope in messages; (3) Breaking changes are extensive — multiple Agent parameter renames, reasoning=True removed, DuckDuckGoTools methods renamed, etc. This is an upgrade that requires going through the migration guide item by item.
Haystack 3.1.0 highlights: (1) Experimental `CompactionHook` with `SlidingWindowCompactor` (drop old turns) and `ToolResultPruningCompactor` (replace old tool results with placeholders) for managing context blowup in long conversations; (2) `AgentTool` lets you wrap a full Agent as another Agent's tool — the caller sees only the final reply, not intermediate steps; (3) Multiple pipeline deserialization and Jinja sandbox RCE vulnerabilities patched, plus several behavioral changes requiring migration (e.g. `Agent.state_schema` semantics changed, `custom_filters` now requires `unsafe=True`).
Mastra @mastra/core@1.62.0 has three highlights: (1) new Computer-Use Sandboxes let agents drive a virtual desktop through the Daytona or E2B Desktop providers — 11 tools for screenshots, clicks, typing, and scrolling; (2) new `@mastra/elasticsearch` and `@mastra/valkey`/`@mastra/valkey-streams` storage backends widen production storage options; (3) 7 breaking changes, including dropped Cloudflare KV/ClickHouse support for background task storage, a changed `DaytonaSandbox` command result format, and the removed `persistPartialOnAbort` option on `agent.stream()`.
CrewAI 1.15.18 highlights: (1) conversational Flow is officially promoted from crewai.experimental to a stable API — the canonical implementation moves to crewai.flow, while crewai.experimental.conversational stays importable as a compatibility alias, so existing code doesn't break; (2) the shim currently emits no deprecation warning, so migrating is entirely opt-in for now; (3) also fixes a wrong Claude Sonnet 4.6 context-window mapping and a too-low Anthropic max_tokens default for large tool calls. No breaking changes.
Mastra @mastra/core@1.63.0 in three points: (1) a new `AdaptableLogger` contract writes trace_id/span_id straight into native log records, replacing the old dual-write wrapper — `PinoLogger` in `@mastra/loggers` is the first to support it; (2) `@mastra/deployer` adds a standalone worker entry with a `/health` endpoint (503 while starting, 200 once ready) so deployment platforms can judge whether a rollout is safe; (3) breaking change: `@mastra/playground-ui`'s DataList drops `variant="lined"`/`flushLeft`/`flushRight`/`MonoCell` in favor of `DataList.TextCell font="mono"`.
Pydantic AI 2.36.0 highlights: (1) new `@durable_operation` decorator turns any custom capability method into a replay-safe durable unit under Temporal/Prefect/DBOS and other engines; (2) a public backend API (`BaseDurabilityCapability`, `CallableOperationBackend`, `RegisteredOperationBackend`) lets third-party durable engines integrate with zero private imports — verified against three out-of-tree engines; (3) one compatibility tightening: MCP tools can no longer opt out of durable execution via tool metadata (previously allowed on DBOS), plus a Prefect dynamic-tool cache-key fix.