# PEP-XXXX: Title

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| Field | Value |
|---|---|
| **PEP** | XXXX |
| **Title** | |
| **Status** | Draft |
| **Author(s)** | Name (@github-handle) |
| **Sponsor** | _(required for non-maintainers)_ |
| **Created** | YYYY-MM-DD |
| **Tracking Issue** | _(filled after acceptance)_ |
| **Target Release** | _(filled after acceptance)_ |

## Summary

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One paragraph. What is this proposal, and why should someone care?
A reader should be able to decide whether to keep reading from this section alone.
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## Motivation

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Why is this change needed? What problem does it solve? Who benefits?
Include concrete examples or user stories where possible.
Link to GitHub issues, Discord discussions, or community meeting notes that motivated this proposal.
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### Goals

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Bulleted list of what this PEP aims to achieve.
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### Non-Goals

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Bulleted list of what this PEP explicitly does NOT aim to achieve.
Being clear about scope prevents scope creep during review and implementation.
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## Design

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The core of the proposal. Describe the technical design in enough detail that:
1. Someone familiar with the codebase could implement it
2. Someone unfamiliar could understand the approach and trade-offs

Structure this section however makes sense for your proposal. Common subsections:
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### User-Facing Configuration

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If this feature involves configuration changes, show the YAML that users would write.
Include a complete, working example — not pseudocode.
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```yaml
# Example configuration
```

### Architecture

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How does this fit into Plano's existing architecture?
Which crates/components are affected? What's the data flow?
Diagrams are welcome (use Mermaid or link to an image).
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### API Changes

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Any new or changed HTTP endpoints, headers, or response formats.
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### Behavior

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Describe the runtime behavior in detail.
What happens on the happy path? What happens on errors?
How does this interact with existing features (routing, streaming, tracing, etc.)?
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## Alternatives Considered

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What other approaches did you evaluate? Why did you choose this design over them?
This section demonstrates thoroughness and helps reviewers understand the design space.

For each alternative:
- Brief description of the approach
- Why it was rejected (trade-offs, complexity, limitations)
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## Compatibility

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Does this change break any existing behavior? If so:
- What breaks?
- What's the migration path?
- Should there be a deprecation period?

If this is purely additive, say so explicitly.
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## Observability

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How will operators know this feature is working correctly?
- New metrics, traces, or log entries?
- Integration with existing Agentic Signals?
- Dashboard or alerting recommendations?
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## Security Considerations

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Does this change affect Plano's security posture?
- New attack surfaces?
- Authentication/authorization implications?
- Data handling (PII, credentials, etc.)?

If not applicable, briefly explain why.
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## Test Plan

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How will this be tested?
- Unit tests (which crates?)
- Integration tests
- E2E tests (new demo or test scenario?)
- Performance/load testing considerations

Be specific enough that a reviewer can evaluate coverage.
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## Implementation Plan

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How will this be implemented? Suggested breakdown:
- Phases or PRs (if the work is large enough to split)
- Which crates/files are primarily affected
- Estimated complexity (small / medium / large)
- Any dependencies on other work
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## Open Questions

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Unresolved design questions that you'd like feedback on during review.
Number them so reviewers can reference specific questions.

Remove this section (or mark all as resolved) before the PEP is accepted.
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## References

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Links to related GitHub issues, discussions, external documentation,
research papers, or prior art in other projects.
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