Mistle

v0.20.0 Feature

This release adds 4 notable features for engineering teams evaluating rollout.

Published 11d AI Agents & Assistants

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✓ No known CVEs patched

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✓ No known CVEs patched in this version

Affected surfaces

auth rce_ssrf

ReleasePort's take

Light signal

editorial:auto 10d

Version v0.20.0 introduces new features such as a remote MCP server catalog helper, Google Cloud MCP integration, and idempotency support for sandboxd and the opencode submission flow.

Why it matters: These additions expand platform capabilities but require developers to update integrations before the May 23, 2026 release date.

Summary

AI summary

Updates 0.20.0] - 2026-05-23, Bug Fixes, and Refactors across a mixed release.

Changes in this release

Type	Severity	Summary	CVE
Feature
Feature	Medium	Add remote mcp server catalog helper Add remote mcp server catalog helper Source: llm_adapter@2026-05-24 Confidence: high	—
Feature	Medium	Add google cloud mcp integration Add google cloud mcp integration Source: llm_adapter@2026-05-24 Confidence: high	—
Feature	Medium	Scaffold oauth provider server dispatch Scaffold oauth provider server dispatch Source: llm_adapter@2026-05-24 Confidence: high	—
Feature	Medium	Add selectable google cloud mcp servers Add selectable google cloud mcp servers Source: llm_adapter@2026-05-24 Confidence: high	—
Feature	Medium	Add sandboxd liveness diagnostics Add sandboxd liveness diagnostics Source: llm_adapter@2026-05-24 Confidence: high	—
Feature	Medium	Add sandboxd idempotency record semantics Add sandboxd idempotency record semantics Source: llm_adapter@2026-05-24 Confidence: high	—
Feature	Medium	Add sandboxd idempotency store Add sandboxd idempotency store Source: llm_adapter@2026-05-24 Confidence: high	—
Feature	Medium	Add Mistle Cloud beta notice Add Mistle Cloud beta notice Source: llm_adapter@2026-05-24 Confidence: low	—
Feature	Medium	Add opencode submit idempotency Add opencode submit idempotency Source: llm_adapter@2026-05-24 Confidence: low	—
Feature	Medium	Thread provider delivery with idempotency Thread provider delivery with idempotency Source: granite4.1:30b@2026-05-24-audit Confidence: low	—
Feature	Medium	Retry idempotent provider delivery steps Retry idempotent provider delivery steps Source: granite4.1:30b@2026-05-24-audit Confidence: low	—
Feature	Low	Add Codex proxy idempotency Add Codex proxy idempotency Source: granite4.1:30b@2026-05-24-audit Confidence: low	—
Feature	Low	Add pi proxy idempotency Add pi proxy idempotency Source: granite4.1:30b@2026-05-24-audit Confidence: low	—
Bugfix
Bugfix	Medium	Reconcile transparent proxy local destinations Reconcile transparent proxy local destinations Source: llm_adapter@2026-05-24 Confidence: high	—
Bugfix	Medium	Preserve bootstrap on deadline touch failure Preserve bootstrap on deadline touch failure Source: granite4.1:30b@2026-05-24-audit Confidence: low	—
Bugfix	Medium	Harden egress proxy child supervision Harden egress proxy child supervision Source: granite4.1:30b@2026-05-24-audit Confidence: low	—
Bugfix	Medium	Recover failed trigger conversation sandboxes Recover failed trigger conversation sandboxes Source: granite4.1:30b@2026-05-24-audit Confidence: low	—
Bugfix	Medium	Harden sandboxd liveness sampler Harden sandboxd liveness sampler Source: granite4.1:30b@2026-05-24-audit Confidence: low	—
Bugfix	Medium	Repair delivery idempotency propagation Repair delivery idempotency propagation Source: granite4.1:30b@2026-05-24-audit Confidence: low	—
Bugfix	Medium	Destroy provider sandbox when deleting sessions Destroy provider sandbox when deleting sessions Source: granite4.1:30b@2026-05-24-audit Confidence: low	—
Bugfix	Low	Update local destination nft set atomically Update local destination nft set atomically Source: granite4.1:30b@2026-05-24-audit Confidence: low	—
Bugfix	Low	Accept scheduled trigger schedule metadata Accept scheduled trigger schedule metadata Source: granite4.1:30b@2026-05-24-audit Confidence: low	—
Bugfix	Low	Address egress proxy child review feedback Address egress proxy child review feedback Source: granite4.1:30b@2026-05-24-audit Confidence: low	—
Bugfix	Low	Stop polling unavailable resources Stop polling unavailable resources Source: granite4.1:30b@2026-05-24-audit Confidence: low	—
Bugfix	Low	Preserve sandboxd liveness journal errors Preserve sandboxd liveness journal errors Source: granite4.1:30b@2026-05-24-audit Confidence: low	—
Bugfix	Low	Debounce sessions search queries Debounce sessions search queries Source: granite4.1:30b@2026-05-24-audit Confidence: low	—
Bugfix	Low	Update TensorLake image build process Update TensorLake image build process Source: granite4.1:30b@2026-05-24-audit Confidence: low	—
Refactor
Refactor	Medium	Run sandbox egress proxy as child process Run sandbox egress proxy as child process Source: granite4.1:30b@2026-05-24-audit Confidence: low	—
Refactor	Low	Split control request handling logic Split control request handling logic Source: granite4.1:30b@2026-05-24-audit Confidence: low	—
Refactor	Low	Split conversation delivery steps Split conversation delivery steps Source: granite4.1:30b@2026-05-24-audit Confidence: low	—

Full changelog

[0.20.0] - 2026-05-23

Features

Add remote mcp server catalog helper (#2394)
Add google cloud mcp integration (#2396)
Scaffold oauth provider server dispatch (#2395)
Add selectable google cloud mcp servers (#2398)
Add Mistle Cloud beta notice (#2400)
Add sandboxd liveness diagnostics (#2417)
Add sandboxd idempotency record semantics (#2420)
Add sandboxd idempotency store (#2422)
Add opencode submit idempotency
Add codex proxy idempotency
Add pi proxy idempotency
Thread provider delivery idempotency
Retry idempotent provider delivery steps

Bug Fixes

Reconcile transparent proxy local destinations (#2407)
Update local destination nft set atomically (#2408)
Accept scheduled trigger schedule metadata (#2409)
Preserve bootstrap on deadline touch failure (#2411)
Harden egress proxy child supervision (#2413)
Address egress proxy child review feedback (#2414)
Recover failed trigger conversation sandboxes (#2415)
Stop unavailable resource polling (#2416)
Harden sandboxd liveness sampler (#2418)
Preserve sandboxd liveness journal errors (#2419)
Debounce sessions search (#2421)
Repair delivery idempotency propagation (#2429)
Destroy provider sandbox when deleting sessions (#2430)
Update tensorlake image build (#2431)

Refactors

Split control request handling (#2392)
Run sandbox egress proxy as child process (#2410)
Split conversation delivery steps

Documentation

Audit sandboxd module comments
Update Mistle README positioning (#2397)
Add google cloud integration setup (#2401)

Tests

Fix scheduled system runtime harnesses (#2412)

Chores

(deps) Bump posthog-js from 1.372.10 to 1.373.4
(deps) Bump @storybook/react-vite from 10.3.6 to 10.4.0
Hide sandbox settings route (#2399)
(release) V0.20.0 (#2432)
Update tl sdk version in pnpm workspace (#2433)

View diff on GitHub

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