olp/AGENTS.md

Inherits: @~/.cc-rules/AGENTS.md

OLP — Open LLM Proxy — Agent Guidelines

Scope: the dtzp555-max/olp repository. Audience: any AI coding agent (Claude Code / Cursor / OpenCode / Copilot / Codex / Gemini) touching OLP source.

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What this project is

OLP (Open LLM Proxy) is a personal- and family-scale multi-provider LLM proxy. It exposes a single OpenAI-compatible HTTP endpoint (/v1/chat/completions) and routes each request to one of N provider plugins, each of which spawns the corresponding provider CLI (e.g. claude -p, codex exec --json, vibe --prompt). An IR (Intermediate Representation) normalizes between the entry surface and each provider's native shape. Intelligent fallback chains advance one provider at a time on configured triggers; content-addressed caching minimizes quota consumption.

OLP supersedes OCP (Open Claude Proxy) as of v1.0. The trigger was the 2026-05-14 Anthropic announcement (effective 2026-06-15) splitting CLI/Agent SDK traffic out of the Pro/Max subscription pool — OCP's foundational assumption ("subscription = unlimited within rate limits") broke for Anthropic on that date. Spreading risk across multiple providers is the structural response.

OLP is not a commercial multi-tenant SaaS, not an enterprise gateway competing with LiteLLM/OpenCode/CLIProxyAPI on breadth, not a model-capability router ("route to the smartest model"), and not a conversation-state store (clients manage their own state). See ALIGNMENT.md Core Principle and docs/adr/0001-project-founding.md.

Runtime: Node.js (ESM, .mjs throughout). No build step. No bundler. server.mjs is the single executable entrypoint. The architecture is spawn-binary: OLP spawns the real provider CLI for every uncached request.

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Stack

• Node.js >=18, native ESM modules
• http/https built-ins for the proxy core (no Express, no Fastify)
• models-registry.json as the single source of truth for (provider, model) → metadata mappings (analogous to OCP's models.json; SPOT discipline will be codified in a Phase 1 ADR — OLP ADR 0003 is currently the IR design, not the SPOT codification)
• GitHub Actions for CI (alignment.yml, release.yml, test.yml)
• gh CLI assumed for PR creation and release automation
• No TypeScript. No test framework beyond test-features.mjs (run via npm test; CI workflow .github/workflows/test.yml). Keep dependencies minimal.

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Key files to know

• server.mjs — HTTP listener, entry surface (/v1/chat/completions, /health, /v1/models, etc.), plugin loader, request dispatch. Governed by ALIGNMENT.md.
• lib/providers/ — per-provider plugins. Each file (anthropic.mjs, openai.mjs, mistral.mjs, …) implements the Provider contract documented in ADR 0002.
• lib/ir/ — Intermediate Representation definition + serializers. Governed by ADR 0003.
• lib/cache/ — content-addressed cache layer (per-key isolation, cache_control bypass, chunked stream replay, singleflight). Governed by ADR 0005.
• lib/fallback/ — fallback engine (trigger detection, chain advancement, idempotent-failure safety, header annotation). Governed by ADR 0004.
• lib/keys.mjs — multi-key auth, per-key namespacing, identity layer. Carries OCP's per-key isolation model into OLP. 🟡 Phase 2 — D44 core + D45 server integration + D46 owner gating shipped (validateKey on every /v1/ + /health; chain filtered by providers_enabled; touchLastUsed fires post-response; /health payload trimmed for non-owner; X-OLP-Fallback-Detail gated by fallback_detail_header_policy). Remaining: keygen CLI bootstrap surface; Phase 2 close → v0.2.0.*
• lib/audit.mjs — append-only ndjson audit per ADR 0007 § 6.2 + § 8. 🟡 D45 — appendAuditEvent + getAuditDropCount shipped. Fires per /v1/chat/completions + /v1/models request including 401/403/5xx paths. Warn+1-retry on append failure; no memory buffer at Phase 2 (forward path).
• dashboard.html — owner-only multi-provider dashboard (quota panels, fallback rate, cache hit rate). 📋 Planned (Phase 6) — not yet authored.
• models-registry.json — single source of truth for (provider, model) → metadata. SPOT.
• ALIGNMENT.md — the constitution. Binding for any plugin / entry-surface / IR change.
• docs/adr/ — Architecture Decision Records. Read the index in docs/adr/README.md before proposing governance, SPOT, or contract changes.
• .github/workflows/alignment.yml — CI blacklist grep + per-provider citation soft check; fails the build on known-hallucinated tokens.
• CLAUDE.md — Claude-Code-specific session instructions + release_kit overlay (Iron Rule 5.5).

Implementation status note (as of 2026-05-25): Files marked 📋 above are designed and documented but not yet on disk; files marked 🟡 are partially shipped (specific components landed; others scheduled). For the full status table see README.md § "Implementation status". The shipped set as of D46 is: server.mjs (with Phase 2 auth middleware + audit wire + owner-vs-non-owner gating), lib/ir/, lib/providers/{anthropic,codex,mistral}.mjs, lib/cache/{keys,store}.mjs, lib/fallback/engine.mjs, lib/keys.mjs (core + loadAuthConfigSync — D44 + D45), lib/audit.mjs (D45), models-registry.json, test-features.mjs (Suites 19 + 20 + 21). Phase 2 in progress: keygen CLI bootstrap surface; Phase 2 close → v0.2.0 (maintainer-triggered).

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Project-specific constraints

• ALIGNMENT.md is binding. Any PR touching a provider plugin, the entry surface, or the IR must cite the relevant authority (provider CLI documentation / OpenAI spec URL / ADR number) in the commit body and PR description. See CLAUDE.md § "Hard requirements for plugin / server.mjs changes" and ALIGNMENT.md Rules 1, 2, 5.
• Alignment CI is not suppressible. The alignment.yml workflow greps for known-hallucinated tokens (currently carrying OCP's api.anthropic.com/api/oauth/usage as a transitive guardrail) and runs per-provider sanity checks. Adding new blacklist tokens is done via PR amendment to alignment.yml; removing entries requires an ALIGNMENT.md amendment PR.
• No self-approval. Implementation author cannot merge their own PR (Iron Rule 10). A fresh-context reviewer must open the cited authority and confirm in the review comment.
• models-registry.json is the only place to add/edit (provider, model) metadata. Do not touch hardcoded model maps in server.mjs, lib/providers/*.mjs, or setup.mjs (📋 setup.mjs is planned, not yet authored). The OLP ADR that codifies this SPOT discipline lands in Phase 1 (OCP's ADR 0003 — models.json SPOT — is the precedent; OLP needs its own SPOT ADR because the registry shape differs).
• Provider plugins follow the contract in ADR 0002. A new provider plugin must implement every method on the Provider contract (name, displayName, models, auth, spawn, estimateCost, quotaStatus, healthCheck, hints). Partial implementations are unalignable per ALIGNMENT.md Rule 4.
• No anti-fingerprinting. OLP is honest about spawning the real CLI. If a provider detects subscription-spawn proxying and bans it, the response is to drop the provider per ADR 0006, not to mask the spawn.
• No conversation state. OLP is a stateless proxy. Memory / continuity is the client's responsibility (see ADR 0001 § Non-mission).

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Release protocol

OLP follows the machine-readable release_kit: overlay in CLAUDE.md (Iron Rule 5.5). Before any version bump or tag push, re-read that YAML block and walk every item in new_feature_doc_expectations and bootstrap_quirk_policy. Tag push triggers .github/workflows/release.yml, which creates the GitHub Release automatically — do not create the release manually.

Version is sourced from package.json; changelog from CHANGELOG.md; user-facing docs from README.md. The Supported Providers table in README.md is sourced from models-registry.json per the overlay; do not hand-edit it out of sync.

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Handoff expectations

A fresh session picking up OLP work should read, in order:

1. This file (AGENTS.md).
2. ALIGNMENT.md — constitution; non-optional.
3. CLAUDE.md — tool-specific instructions and release_kit overlay.
4. docs/adr/ — most recent ADRs first; they explain why the current structure exists. Founding ADRs 0001–0006 are the OLP-bootstrap set.
5. ~/.cc-rules/memory/projects/olp_v0_1_spec.md — the v0.1 spec (authoritative for OLP scope until v1.0 ships).
6. ~/.cc-rules/memory/auto/MEMORY.md — cross-machine memory index.

Only after these should the session touch code.

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Authors: project maintainer (with AI drafting assistance).