schema-projections skillA
schema-projections is agent-read markdown (skill) from estuary/agent-skills: Add projections to collections to rename fields or map nested JSON paths to flat column names. Use when renaming fields for destination conventions, flattening nested paths to columns, or creating field aliases. Use when user says "rename field", "flatten nested JSON", "map JSON path to column", "field alias", or "projection"..
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What the file says
# Projections
Add projections to collections to rename fields or map nested JSON paths to flat column names.
**Docs:** https://docs.estuary.dev/concepts/advanced/projections/
## When to Use
- Rename fields to match destination naming conventions
- Flatten nested JSON paths to column names (e.g., `/user/name` → `user_name`)
- Extract array elements as named fields
## Procedure
### Step 1: Pull the Collection Spec
```bash
flowctl catalog pull-specs --name <collection-name>
```
### Step 2: Add Projections
Add a `projections` stanza to the collection spec (top-level, alongside `key` and schema):
```yaml
collections:
tenant/your/collection:
schema: schema.yaml
key: [/id]
projections:
# Rename a top-level field
user_id: /id
# Flatten nested paths
customer_name: /customer/name
customer_email: /customer/email
# Extract array elements
primary_tag: /tags/0
```
Values are JSON Pointers: `/` separated, array indices numeric (`/tags/0`).
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How to install
mdr add estuary/agent-skills/schema-projections@git:20260707.049f6aemdr add estuary/agent-skills/schema-projections@sha256:08f110e29b1f548aPin to a label to follow the author's releases, or to a sha256 to freeze the exact bytes forever. Either way the resolved hash is written to mdr.lock, and mdr install reproduces it on any machine.
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Source
estuary/agent-skills · 7 stars · license Apache-2.0 · pushed 2026-09-17 · branch main
API
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