River

Company: Shopify
Approach type: Agent
Work: Coding
Human involvement: Unknown
Invocation: Interactive
Interfaces: Slack
Deployment stage: Deployed
Evidence strength: Detailed primary
Entry reviewed: 2026-09-17

Purpose

River is Shopify’s internal Slack agent for investigating questions and making code changes in public threads.

Check the reviewed sources and claim details.

How it works

Representative workflow: public Slack question → collaborative investigation or code change. Research details

Receive a request

An employee mentions River in a public Slack channel.

Investigate and act

River reads files, runs tests and queries, and posts findings; it can open pull requests.

Continue collaboratively

Colleagues add constraints and redirect the work within the same thread.

Where people stay involved

Each scope pairs its normal attention boundary with supporting evidence. See the supervision definitions for the level mapping and limits.

Unreported: The source describes a colleague optionally redirecting a public thread, but does not require continuous steering or a universal PR approval checkpoint.

public Slack question → collaborative investigation or code change
Unknown · Level unknown

Catalog interpretation: Unclassified for public Slack question → collaborative investigation or code change; human attention boundary: unknown.

Observed in 2026

Implementation details

Model: Not reportedNot documented for this subject in the reviewed source.
Harness: An agent profile on Aquifer.
Sandbox: Not reportedNot documented for this subject in the reviewed source.
Tool access: Code, tests, data warehouse and production traces.
Knowledge: World monorepo, skills and shared Slack transcripts.
Context management: Not reportedNot documented for this subject in the reviewed source.
Credentials: Not reportedNot documented for this subject in the reviewed source.
Interfaces: slack

Validation and failure handling

Unreported: The reviewed source does not report a distinct validation process for this subject.

Reported observations

The catalog records what the sources report, with the scope and the denominator of every figure. A qualification below limits the figure it sits under.

Adoption output · Reported measurement · River: 59,918 sessions across 5,170 Slack channels in a reported 30-day period; 3,536 River-coauthored PRs merged.

Key observation

59,918 sessions across 5,170 Slack channels in a reported 30-day period; 3,536 River-coauthored PRs merged.

Reported by: Shopify
Scope: River: 59,918 sessions across 5,170 Slack channels in a reported 30-day period; 3,536 River-coauthored PRs merged.
Method: river_sessions domain table written by River each session

The source does not report the denominator of this figure.

Lessons

Unreported: The reviewed source does not document this for the named subject.

Sources and research details

Citations link to the original publisher. Each source also keeps a preserved copy in the repository, so a changed or removed page stays checkable.

Under the Riverhttps://shopify.engineering/under-the-riverEngineering blog · First party · Last source verification: 2026-08-31

Question coverage and scope

purpose: Reported
workflow: Reported
human involvement: Unreported: The source describes a colleague optionally redirecting a public thread, but does not require continuous steering or a universal PR approval checkpoint.
implementation: Reported
validation: Unreported: The reviewed source does not report a distinct validation process for this subject.
observations: Reported
lessons: Unreported: The reviewed source does not document this for the named subject.

Research details for every claim on this page

Summary
Statement type
Fact
Provenance
Reported
Confidence
High
Confidence reason
A linked first-party source states the claim.
- SupportsUnder the RiverPart II: River only works in the open; At scale; River is one profile
Harness
Statement type
Fact
Provenance
Reported
Confidence
High
Confidence reason
A linked first-party source states the claim.
- SupportsUnder the RiverPart II: River only works in the open; At scale; River is one profile
Tool access
Statement type
Fact
Provenance
Reported
Confidence
High
Confidence reason
A linked first-party source states the claim.
- SupportsUnder the RiverPart II: River only works in the open; At scale; River is one profile
Knowledge
Statement type
Fact
Provenance
Reported
Confidence
High
Confidence reason
A linked first-party source states the claim.
- SupportsUnder the RiverPart II: River only works in the open; At scale; River is one profile
Interfaces
Statement type
Fact
Provenance
Reported
Confidence
High
Confidence reason
A linked first-party source states the claim.
- SupportsUnder the RiverPart II: River only works in the open; At scale; River is one profile
Receive a request
Statement type
Fact
Provenance
Reported
Confidence
High
Confidence reason
A linked first-party source states the claim.
- SupportsUnder the RiverPart II: River only works in the open; At scale; River is one profile
Investigate and act
Statement type
Fact
Provenance
Reported
Confidence
High
Confidence reason
A linked first-party source states the claim.
- SupportsUnder the RiverPart II: River only works in the open; At scale; River is one profile
Continue collaboratively
Statement type
Fact
Provenance
Reported
Confidence
High
Confidence reason
A linked first-party source states the claim.
- SupportsUnder the RiverPart II: River only works in the open; At scale; River is one profile
Key observation
Statement type
Metric
Provenance
Reported
Confidence
Medium
Confidence reason
Self-reported by the source; no independent verification.
Reported by
Shopify
Scope
River: 59,918 sessions across 5,170 Slack channels in a reported 30-day period; 3,536 River-coauthored PRs merged.
Denominator
Not reported
Method
river_sessions domain table written by River each session
Observation date
Not reported
- SupportsUnder the RiverAt scale: recent 30-day river_sessions domain-table counts
Operating model assessment
Statement type
Inference
Provenance
Catalog judgment
Confidence
Unverified
Confidence reason
The source describes a colleague optionally redirecting a public thread, but does not require continuous steering or a universal PR approval checkpoint.
Observation date
2026
- SupportsUnder the RiverRiver only works in the open: well-going thread includes a colleague redirect and continued collaboration