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v3.238.0 Feature

This release adds 3 notable features for engineering teams evaluating rollout.

Published 21d Infrastructure as Code
✓ No known CVEs patched
Read the diff → Tool health → What is this tool? →

✓ No known CVEs patched in this version

Topics

aws azure cloud cloud-computing containers c#
+10 more
.net fsharp gcp go iac javascript kubernetes python serverless typescript

ReleasePort's take

Moderate signal
editorial:auto 13d

Pulumi v3.238.0 adds `--output json` to `pulumi up` for structured results. Breaking changes: `pulumi cloud api` → `pulumi api` and `--format` → `--output` flags.

Why it matters: Update CI/CD scripts and automation replacing `pulumi cloud api` with `pulumi api` and `--format` with `--output`. Use new `--output json` for structured operation results and better integration.

Summary

AI summary

Add --output json to pulumi up for a structured JSON summary of the operation result.

Changes in this release

Breaking Medium

`pulumi cloud api` renamed to `pulumi api`.

`pulumi cloud api` renamed to `pulumi api`.

Source: llm_adapter@2026-05-21

Confidence: low

 —
Breaking Medium

`--format` flag renamed to `--output` on `pulumi api` and subcommands.

`--format` flag renamed to `--output` on `pulumi api` and subcommands.

Source: llm_adapter@2026-05-21

Confidence: low

 —
Feature Medium

Add a `--language` flag to `pulumi package add`.

Add a `--language` flag to `pulumi package add`.

Source: llm_adapter@2026-05-21

Confidence: high

 —
Feature Medium

`pulumi up` now supports `--output json` for structured result summary.

`pulumi up` now supports `--output json` for structured result summary.

Source: llm_adapter@2026-05-21

Confidence: high

 —
Feature Medium

Recommend `pulumi cloud api describe` in `pulumi cloud api --help`.

Recommend `pulumi cloud api describe` in `pulumi cloud api --help`.

Source: llm_adapter@2026-05-21

Confidence: high

 —
Feature Medium

Add `pulumi stack webhook list` to list webhooks for a stack.

Add `pulumi stack webhook list` to list webhooks for a stack.

Source: llm_adapter@2026-05-21

Confidence: high

 —
Feature Medium

Add `pulumi insights resource get` to lookup a single Insights-discovered resource.

Add `pulumi insights resource get` to lookup a single Insights-discovered resource.

Source: llm_adapter@2026-05-21

Confidence: high

 —
Feature Medium

Add `pulumi template list` to list registry-backed templates.

Add `pulumi template list` to list registry-backed templates.

Source: llm_adapter@2026-05-21

Confidence: high

 —
Feature Medium

Add `pulumi insights resource search` to search Insights-discovered resources.

Add `pulumi insights resource search` to search Insights-discovered resources.

Source: llm_adapter@2026-05-21

Confidence: high

 —
Feature Medium

`--skip-plugin-pre-install` added to skip up-front plugin installation.

`--skip-plugin-pre-install` added to skip up-front plugin installation.

Source: llm_adapter@2026-05-21

Confidence: high

 —
Feature Medium

`pulumi neo` TUI now renders the agent's TODO list.

`pulumi neo` TUI now renders the agent's TODO list.

Source: llm_adapter@2026-05-21

Confidence: high

 —
Feature Medium

Add `--approval-mode` and `--permission-mode` flags to `pulumi neo` with hotkeys.

Add `--approval-mode` and `--permission-mode` flags to `pulumi neo` with hotkeys.

Source: llm_adapter@2026-05-21

Confidence: high

 —
Feature Medium

When invoked by AI coding agent, print `pulumi api` pointers after `pulumi package add` and `pulumi package gen-sdk`.

When invoked by AI coding agent, print `pulumi api` pointers after `pulumi package add` and `pulumi package gen-sdk`.

Source: llm_adapter@2026-05-21

Confidence: high

 —
Feature Medium

Recognize `hcl` and `pcl` runtimes in `integration.ProgramTest`.

Recognize `hcl` and `pcl` runtimes in `integration.ProgramTest`.

Source: llm_adapter@2026-05-21

Confidence: high

 —
Feature Medium

Add `l1-config-types-optional` conformance test for PCL's `optional` type constructor.

Add `l1-config-types-optional` conformance test for PCL's `optional` type constructor.

Source: llm_adapter@2026-05-21

Confidence: high

 —
Dependency Medium

Add registerPackage helper to cache package references per deployment.

Add registerPackage helper to cache package references per deployment.

Source: llm_adapter@2026-05-21

Confidence: high

 —
Performance Medium

Speed up Python program resolution using a set instead of deque.

Speed up Python program resolution using a set instead of deque.

Source: llm_adapter@2026-05-21

Confidence: high

 —
Bugfix Medium

Minify JSON persisted by the DIY backend for checkpoints, history, and stack tags.

Minify JSON persisted by the DIY backend for checkpoints, history, and stack tags.

Source: llm_adapter@2026-05-21

Confidence: high

 —
Bugfix Medium

Ignore non-conforming property values in maps during HCL2 import.

Ignore non-conforming property values in maps during HCL2 import.

Source: llm_adapter@2026-05-21

Confidence: high

 —
Bugfix Medium

Stop dropping map values with union of Input-wrapped types during HCL2 import.

Stop dropping map values with union of Input-wrapped types during HCL2 import.

Source: llm_adapter@2026-05-21

Confidence: high

 —
Bugfix Medium

Use selected stack's organization in `pulumi neo` task instead of user default.

Use selected stack's organization in `pulumi neo` task instead of user default.

Source: llm_adapter@2026-05-21

Confidence: high

 —
Bugfix Medium

Include failure reason in `pulumi_preview` and `pulumi_up` tool results on failure.

Include failure reason in `pulumi_preview` and `pulumi_up` tool results on failure.

Source: llm_adapter@2026-05-21

Confidence: high

 —
Bugfix Medium

Retry `pulumi neo` task creation without attached stack on backend error.

Retry `pulumi neo` task creation without attached stack on backend error.

Source: llm_adapter@2026-05-21

Confidence: high

 —
Bugfix Medium

Surface failure reason when a `filesystem` tool call fails in Neo.

Surface failure reason when a `filesystem` tool call fails in Neo.

Source: llm_adapter@2026-05-21

Confidence: high

 —
Bugfix Medium

Use `--output=markdown` instead of removed `--format=markdown` in API pointers.

Use `--output=markdown` instead of removed `--format=markdown` in API pointers.

Source: llm_adapter@2026-05-21

Confidence: high

 —
Bugfix Medium

Stop reporting spurious circular references for specific entry types.

Stop reporting spurious circular references for specific entry types.

Source: llm_adapter@2026-05-21

Confidence: high

 —
Bugfix Medium

Fail deployment when an after hook fails.

Fail deployment when an after hook fails.

Source: llm_adapter@2026-05-21

Confidence: low

 —
Full changelog

3.238.0 (2026-05-13)

Features

  • [cli] Add a --language flag to pulumi package add to run outside a Pulumi project or plugin
    #22791

  • [cli] Add --output json to pulumi up for a structured JSON summary of the operation result
    #22870

  • [cli] Recommend pulumi cloud api describe in pulumi cloud api --help to verify operation parameters before calling
    #22881

  • [cli] Add pulumi stack webhook list to list all webhooks configured for a stack
    #23082

  • [cli/cloud] Rename pulumi cloud api to pulumi api
    #22970

  • [cli/cloud] Add pulumi insights resource get to look up a single resource discovered by Pulumi Insights
    #23077

  • [cli/cloud] Add pulumi template list to list registry-backed templates
    #23074

  • [cli/cloud] Rename the --format flag to --output on pulumi api and its subcommands
    #23072

  • [cli/cloud] Add pulumi insights resource search to search for resources discovered by Pulumi Insights
    #23087

  • [cli/engine] Add --skip-plugin-pre-install to skip up-front plugin installation

  • [engine] Fail the deployment when an after hook fails
    #22935

  • [cli/neo] Render the agent's TODO list in the pulumi neo TUI
    #22864

  • [cli/neo] Add --approval-mode and --permission-mode flags to pulumi neo, with Ctrl+A and Ctrl+R hotkeys to switch modes mid-session
    #22950

  • [cli/package] When invoked by an AI coding agent, print pulumi api pointers after pulumi package add and pulumi package gen-sdk
    #22904

  • [pkg/testing] Recognize the hcl and pcl runtimes in integration.ProgramTest
    #23018

  • [pkg/testing] Add l1-config-types-optional conformance test for PCL's optional type constructor
    #23108

Bug Fixes

  • [backend/diy] Minify JSON persisted by the DIY backend for checkpoints, history, and stack tags
    #22245

  • [cli/import] Ignore property values that do not conform to the schema in maps
    #23076

  • [cli/import] Stop dropping map values whose element type is a union of Input-wrapped types during HCL2 import

  • [cli/neo] Use the selected stack's organization when starting a pulumi neo task instead of the user's default organization
    #22951

  • [cli/neo] Include the failure reason in pulumi_preview and pulumi_up tool results when they fail, so the agent can react instead of seeing a blank error
    #22948

  • [cli/neo] Retry pulumi neo task creation without the attached stack when the backend rejects it with an "invalid entities" error
    #22945

  • [cli/neo] Surface the failure reason when a filesystem tool call fails, instead of returning an empty result to the agent
    #23019

  • [cli/package] Use --output=markdown (not the renamed-away --format=markdown) in the pulumi api pointers printed by pulumi package add and pulumi package gen-sdk
    #23098

  • [programgen/pcl] Stop reporting spurious circular references when an ignoreChanges, hideDiffs, replaceOnChanges, or additionalSecretOutputs entry shares a name with a top-level node
    #22931

  • [sdk/python] Speed up python program resolution by using a set instead of deque to track outputs
    #22946

Miscellaneous

  • [cli/neo] Tag Neo tasks created from the CLI with a cli source so the service can attribute their origin
    #23099

  • [sdk/nodejs] Add registerPackage helper to cache package references per deployment
    #23014

View diff on GitHub

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