pulumi-modify-existing

Original：🇺🇸 English

Translated

Modify existing Pulumi infrastructure stacks safely. Use this skill when making any Pulumi IaC changes — always edit the existing stack entrypoint, never create new files, preserve assumeRole and cross-account configuration, and validate with pulumi preview before finishing.

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Sourcemitodl/agent-kit

Added on2026-05-23

NPX Install

npx skill4agent add mitodl/agent-kit pulumi-modify-existing

SKILL.md Content

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Pulumi: Modify Existing Files

Always modify, never create

Infrastructure changes belong in the existing entrypoint for the stack (typically

__main__.py

). Do not create additional Pulumi files unless the stack already follows a multi-file pattern that makes a new file the right fit.

Preserve existing functionality

When editing a Pulumi stack entrypoint, the following must never be silently removed:

assumeRole
/ cross-account role configuration — removing this breaks production deployments that depend on cross-account access.
Existing resource exports (
```
pulumi.export(...)
```
).
Stack references to other stacks.

Before finalizing changes, scan the diff to confirm nothing was deleted unintentionally.

Validate changes before declaring done

After modifying any Pulumi code, run a preview to confirm the plan is correct:

bash

pulumi preview --stack <stack-name>

Review the output carefully:

Unexpected resource replacements or deletions are bugs, not acceptable side effects.
"0 changes" is only correct if you genuinely expected no changes.