Composer docs: the composer section of prisma.config.ts replaces prisma-composer.config.ts

[wmadden-electric]

Linear: TML-3340

Composer's configuration is now the composer section of prisma.config.ts (prisma/composer#328), and prisma-composer.config.ts is refused (prisma/composer#331). These pages told readers to write the old file.

// prisma.config.ts
import { definePrismaConfig } from 'prisma/config';
import { defineConfig as composer } from '@prisma/composer/config';
import { prismaCloud, prismaState } from '@prisma/composer-prisma-cloud/control';

export default definePrismaConfig({
  composer: composer({ extensions: [prismaCloud()], state: prismaState() }),
});

What changes

• Six mentions of prisma-composer.config.ts become the composer section: getting-started (directory tree and code block), porting-an-app, the Compute deploy page, the agent prompt on the index page, and building-blocks. Each page that shows the file now installs prisma as a dev dependency first, since the config imports prisma/config. Getting-started's agent path adds the section to the file prisma init wrote instead of overwriting it, so the skills section survives.
• The effect pre-flight is gone from Composer; a tree that hoists an incompatible effect now fails config evaluation with CLI.CONFIG_UNREADABLE naming the missing module. The deploying page's section is renamed and shows that output with the override fix; getting-started and the Compute deploy page stop telling readers to pin effect themselves and link there.
• cli/configuration.mdx lists the composer section and says it is taken whole from the nearest file that declares it, unlike sections that merge key by key.
• The skill name on the Composer index and the skills page is prisma-composer-core-concepts, its real name.

When to merge

After prisma@8.0.0-rc.20 is on latest (prisma/prisma-cli PR pending). Until then every changed page describes behaviour no released prisma has. solid-start.mdx still prints Composer 0.25.0 and is untouched; the version lint does not check that package.

Verification

lint:links, lint:code, lint:versions, lint:agent-ready, cspell on the changed pages, and pnpm test (76) pass.

Agent: columbo-17

🤖 Generated with Claude Code

Summary by CodeRabbit

• Documentation
  • Updated Prisma Compute and Composer setup guides to install Prisma CLI as a development dependency and configure Composer in prisma.config.ts.
  • Clarified when an effect version override may be needed and added package-manager-specific guidance for resolving version conflicts.
  • Explained how Composer configuration is selected when multiple Prisma config files are present.
  • Updated deployment, extension, and app-porting examples to use the current configuration format.

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Project	Deployment	Actions	Updated
blog	Ready	Preview	Oct 7, 2026 6:30am UTC
docs	Ready	Preview	Oct 7, 2026 6:30am UTC
eclipse	Ready	Preview	Oct 7, 2026 6:30am UTC
site	Ready	Preview	Oct 7, 2026 6:30am UTC

1 Skipped Deployment

Project	Deployment	Actions	Updated
handbook	Skipped		Oct 7, 2026 6:30am UTC

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---

Walkthrough

The documentation now places Prisma Composer settings in the composer section of prisma.config.ts. It also updates setup instructions, CLI configuration inheritance details, and guidance for resolving effect version conflicts.

Changes

Prisma Composer documentation

Layer / File(s)	Summary
Document prisma.config.ts Composer configuration apps/docs/content/docs/(index)/prisma-compute/deploy.mdx, apps/docs/content/docs/cli/configuration.mdx, apps/docs/content/docs/composer/building-blocks.mdx, apps/docs/content/docs/composer/getting-started.mdx, apps/docs/content/docs/composer/porting-an-app.mdx, apps/docs/content/docs/(index)/index.mdx	Setup and configuration examples now place Composer settings in prisma.config.ts. The CLI configuration documentation describes the composer section and its inheritance behavior.
Document effect-version conflict handling apps/docs/content/docs/(index)/prisma-compute/deploy.mdx, apps/docs/content/docs/composer/getting-started.mdx, apps/docs/content/docs/composer/deploying.mdx, apps/docs/content/docs/(index)/index.mdx	The guidance describes config evaluation failures involving conflicting effect versions and gives package-manager-specific override instructions.

Priority: ➖ Normal

Estimated code review effort: 2 (Simple) | ~12 minutes

Change: Other

Suggested reviewers: amanvarshney01

Merge Risk: ⚪ Minimal · up to 2c8ee

The documentation updates Composer configuration and effect-conflict guidance. The remaining concern about pnpm 11 ignoring the documented override location is not supported, so no actionable merge risk remains.

Architecture Summary

Architecture risk: 🔵 Low · up to 2c8ee

The change affects 1 system.

Changed systems: apps/docs

Architecture concerns
No architecture-level concerns identified.

Review details

Systems and components

• observed — apps/docs (service) was modified; 7 changed files map to changed impact.

Before / after behavior

• observed — Modified behavior in apps/docs/content/docs/(index)/prisma-compute/deploy.mdx: The setup instructions remove the requirement to pin the effect family and instead state that Composer pins it, with an override for a conflicting hoisted version.
• observed — Modified behavior in apps/docs/content/docs/(index)/prisma-compute/deploy.mdx: The deploy configuration is now identified as the composer section of prisma.config.ts, rather than a standalone configuration file.
• observed — Modified behavior in apps/docs/content/docs/(index)/prisma-compute/deploy.mdx: The configuration example replaces standalone prisma-composer.config.ts using top-level defineConfig with prisma.config.ts, wrapping the composer options in definePrismaConfig and composer(...).
• observed — Modified behavior in apps/docs/content/docs/(index)/prisma-compute/deploy.mdx: The existing-app instructions no longer ask users to pin effect to a Composer-required version; they state Composer pins it and describe an override for a conflicting version pinned by an existing dependency.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly identifies the main documentation change: using the composer section in prisma.config.ts instead of prisma-composer.config.ts.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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🍈 Lychee Link Check Report

155 links: ✅ 13 OK | 🚫 0 errors | 🔀 5 redirects | 👻 142 excluded

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---

Full Statistics Table

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Actionable comments posted: 1

---

• 🪄 Fix CodeRabbit comments on this PR

🤖 Prompt to fix review comments

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Inline comments:
Review comments at @apps/docs/content/docs/composer/deploying.mdx:
- Line 142: Update the pnpm override guidance in the deploying documentation to
direct pnpm 11 users to place overrides in pnpm-workspace.yaml, while retaining
the package.json "pnpm" location for older pnpm versions. Keep the Yarn
resolutions guidance distinct.

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• Configuration used: Repository UI
• Review profile: CHILL
• Plan: Advanced
• Run ID: a545fbeb-c8ab-470e-905a-33715603fc5b

📥 Commits

Reviewing files that changed from the base of the PR and between b2c9cff and 9029ca2.

📒 Files selected for processing (9)

• apps/docs/content/docs/(index)/index.mdx
• apps/docs/content/docs/(index)/prisma-compute/deploy.mdx
• apps/docs/content/docs/ai/tools/skills.mdx
• apps/docs/content/docs/cli/configuration.mdx
• apps/docs/content/docs/composer/building-blocks.mdx
• apps/docs/content/docs/composer/deploying.mdx
• apps/docs/content/docs/composer/getting-started.mdx
• apps/docs/content/docs/composer/index.mdx
• apps/docs/content/docs/composer/porting-an-app.mdx

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Fixed in 4c98873: the override is shown per package manager, including pnpm-workspace.yaml for pnpm 11.