pragent

An extensible, forge-agnostic PR review framework. Not a product — a toolkit that teams extend with their own review dimensions.

Status: design approved, implementation not started. See docs/plans/2026-08-04-pragent-design.md.

What it is

pragent runs as a CI step. It reads a pull request, decides how much attention the change deserves, runs the analyzers that apply, and posts ranked findings back to the forge.

pragent init      # one-time repo scan → .pragent/profile.yml (committed, reviewable)
pragent review    # the CI step: tier → analyze → aggregate → publish
pragent explain   # why did this PR get this tier / these findings?
pragent replay    # re-run a past PR against a new prompt or model (the eval loop)
pragent doctor    # config, credentials, and adapter health

Why not CodeRabbit / Greptile / Qodo

Those are good products with fixed review dimensions and per-seat pricing. pragent targets the case where a platform team needs to add its own dimensions — an internal compliance rule, a service-catalog ownership check, a house performance idiom — without forking a vendor's reviewer. Cost lands in the same range (~$25/dev/month at 350 PRs/mo for 20 devs), but the analyzers, the data, and the analytics are yours.

Attention tiers

Every PR is classified before any expensive work happens. Deterministic rules decide first; an ambiguous case gets one cheap model call as tie-breaker.

Tier	What it means	Cost/PR
trivial	lockfile bumps, generated code, docs typos	~$0.005
lite	small change, no risk paths	~$0.08
full	the default for real changes	~$0.80–2.00
oversized	too big to review whole; structural summary + deep pass on the hot subset	~$5 ceiling

Every tier decision records why, so a surprising outcome is explainable rather than mysterious.

Extension points

Five, all documented in the design doc. Teams override or add; nobody forks.

1. Analyzers — drop a YAML + prompt in .pragent/analyzers/, or install from npm
2. Forge adapters — Gitea, GitLab, GitHub, local diff
3. Tier policy — thresholds and the path risk map, per repo or per org
4. Profile enrichers — extend what pragent init learns about a repo
5. Emitter sinks — JSONL by default, OpenTelemetry, or your own

Org config can lock keys, so a repo cannot quietly disable the security analyzer.

Design principles

• Polyglot by construction. Language knowledge lives in the repo profile, not in the reviewer. A new language is a profile change, not a core change.
• One shared prompt prefix. All analyzers for a PR share a byte-identical cached prefix. This is what makes fan-out affordable; it is enforced, not hoped for.
• Everything is traceable. Tier reasons, token counts, cost, latency, and finding outcomes are recorded per run. False-positive rate is measurable per analyzer.
• Fail open. A budget ceiling or an analyzer crash yields a partial review with a clear note, never a blocked pipeline with no explanation.

Stack

TypeScript + Node, built on the pi agent SDK. Shipped as an npm package and an OCI image, so CI runners need no local Node install.

Roadmap

1. Walking skeleton — local diff, one analyzer, rules-only tiering
2. Gitea end to end — adapter, Woodpecker step, PR comments, status checks
3. Profile + full tier — pragent init, shared-prefix caching, analyzer fan-out
4. Extensibility hardening — plugin loading, config layering, explain / replay
5. Second forge — GitLab adapter, Jenkins recipe
6. Analytics maturity — OTel export, feedback loop, eval harness

License

TBD.