omnigraph/docs/dev/rfc-008-deprecate-omnigraph-yaml.md

RFC: Deprecate omnigraph.yaml — One Concern per Config Surface

Status: Proposed Date: 2026-06-11 Builds on: rfc-007-operator-config.md (the operator layer that absorbs the identity/credential keys), rfc-005-server-cluster-boot.md (Landed — cluster-booted serving), RFC-006 storage roots (landed: #186/#190/#194). Supersedes in part: RFC-007's "project layer" framing (§Relationship below) and rfc-002-config-cli-architecture.md's assumption that omnigraph.yaml remains the project manifest. Target release: staged; final removal at the next major (see Sequencing).

Summary

Retire omnigraph.yaml. It is three unrelated concerns wearing one filename — server deployment config, project/CLI conveniences, and operator identity — and the mixture is not a cosmetic wart but the root cause of a recurring class of problems: operators keeping personal copies of "project" files, repo checkouts able to carry credential-adjacent keys (the #139 security findings), omnigraph init scaffolding config into unrelated directories, and every config discussion needing a paragraph to establish which of the three files is meant.

The end state is two config surfaces with single owners:

Surface	Owner	Declares
Cluster config (cluster.yaml + catalog)	the team, in a repo	what the system is: graphs, schemas, queries, policies, storage
Operator config (~/.omnigraph/)	one person, in $HOME	who I am: identity, credentials, known servers, ergonomics

plus flags/env for the zero-config tier (one graph, one server, no control plane) — which already works today with no file at all.

omnigraph.yaml has no role left once every key has a better home. This RFC gives each key that home, and stages the retirement so that no working setup breaks without a loud warning, a migration command, and a full deprecation cycle first.

Motivation

• It breaks the ownership logic. A config file must have one owner. A file that carries graphs: (team-owned, reviewable) next to cli.actor (one person's identity) and auth.env_file (credential loading) can be neither safely committed nor sensibly personal. Every real deployment this cycle tripped on it: per-operator copies in ~/exp/intel, graph-scoped alias URIs that only make sense per-person, the #139 findings where a checkout-supplied file could redirect tokens.
• The cluster made it redundant. Since RFC-005/006, a cluster deployment serves from the applied catalog — --cluster mode does not read omnigraph.yaml at all. Stored queries, policies, bindings, and graph addressing all have authoritative homes. What remains in omnigraph.yaml for cluster users is dead weight that can silently disagree with what is actually serving.
• Two declarative dialects is one too many. cluster.yaml and omnigraph.yaml both declare graphs/queries/policies with different schemas, different validation strictness, and different lifecycle guarantees. Maintaining, documenting, and testing both — and explaining when each applies — is a permanent tax (the "programming integrated over time" lens says: this forks on every config-surface change).

Non-Goals

• Breaking anyone now. Every omnigraph.yaml that works today keeps working through the entire deprecation window, with warnings.
• Retiring the zero-config tier. omnigraph-server s3://bucket/g.omni --bind … plus env vars stays first-class forever — that tier needs no file, which is the point.
• Forcing the control plane on single-graph users. The migration target for a multi-graph yaml deployment is a minimal cluster (file-rooted, no bucket required, cluster.yaml barely longer than the graphs: map it replaces) — but a single graph never needs even that.
• Touching cluster.yaml — its schema and strictness are unchanged.

Where every key goes (the complete migration map)

The full OmnigraphConfig surface (verified against crates/omnigraph-server/src/config.rs:182-207):

omnigraph.yaml key	Concern	New home
graphs.<name>.uri	what exists / where	cluster.yaml graphs: (storage-root-derived) — or a flag/env for the zero-config tier
graphs.<name>.queries, top-level queries:	what exists	cluster catalog (.gq discovery, RFC-004/#183)
graphs.<name>.policy.file, top-level policy.file, server.policy.file	what's enforced	cluster.yaml policies: + applies_to bindings
server.bind	deployment runtime	--bind / env (already authoritative; the key is a default)
server.graph	deployment runtime	--target-style flag / env in the zero-config tier; meaningless under cluster boot
graphs.<name>.bearer_token_env, auth.env_file	credentials	operator credentials chain (RFC-007 §D4)
cli.actor	identity	operator.actor (RFC-007 §D3)
cli.output_format, cli.table_*	personal ergonomics	defaults: in operator config (RFC-007 §D2)
cli.graph, cli.branch	personal targeting	operator config: named servers + a per-operator default target (RFC-007 PR 3)
aliases.<name>	personal ergonomics over shared queries	operator config aliases: — the queries they invoke are cluster-owned; the shorthand is personal
query.roots	discovery convenience	obsolete — cluster query discovery (#183) replaced it
project.name	label	dropped (the cluster's metadata.name is the deployment label)

Two placements worth defending:

• Aliases are operator config, not cluster config. The stored query is the shared contract (catalog-owned, digest-pinned); an alias is one person's shorthand with their favorite default params and target. Putting aliases in the cluster would force team review on personal ergonomics; leaving them per-directory recreates today's problem. Per-operator, keyed by server/graph name, is the AWS-profile shape.
• Multi-graph serving without a control plane migrates to a minimal cluster, not to a new file. The honest cost: cluster import + apply once, on a file:// root next to the graphs. The honest benefit: one declarative dialect, one validation path, one serving source — and the upgrade path to buckets/approvals is a one-line storage: change instead of a re-platform.

Deprecation mechanics

Per Hyrum's Law (the repo's own deny-list: shipped observable behavior is contract), retirement is staged, loud, and tooled:

1. Warn. Loading omnigraph.yaml emits a one-line deprecation notice naming the replacement for each key actually present in the file (not a generic banner — the migration map above, applied to your file). Suppressible per-process (OMNIGRAPH_SUPPRESS_YAML_DEPRECATION=1) for CI logs during the window.
2. Migrate. omnigraph config migrate reads an existing omnigraph.yaml and writes the split: the team half as a ready-to-review cluster.yaml (+ moves query/policy files into the checkout layout), the personal half merged into ~/.omnigraph/config.yaml — printing a diff-style summary and touching nothing without --write. The command is the test of the migration map's completeness: any key it cannot place is a bug in this RFC.
3. Stop scaffolding. omnigraph init stops generating omnigraph.yaml (it currently scaffolds one into cwd — the source of the test-pollution bug). omnigraph cluster init (new, small) scaffolds a minimal cluster.yaml instead.
4. Opt-in strict. OMNIGRAPH_NO_LEGACY_CONFIG=1 turns the warning into an error — for teams that finished migrating and want regressions caught.
5. Remove at the next major. Loading the file becomes an error pointing at config migrate. The OmnigraphConfig code path, the dual query-registry loaders, and the yaml-mode server boot source are deleted — the payoff that makes the whole exercise worth it.

Stages 1–3 can land in one release once RFC-007 PRs 1–2 exist (the operator layer must exist before anything can migrate to it). Stage 4 the release after. Stage 5 at the major, with the removal listed in release notes from stage 1 onward.

What this deletes, eventually

• The OmnigraphConfig struct and its 12-key surface, the load_config/load_cli_config pair and its env-side-effect, the scaffolder, and the legacy resolution paths (resolve_cli_graph's dual modes — finding #11's root cause).
• The yaml-mode multi-graph server boot (ServerConfigMode::Multi keeps existing — cluster boot constructs it — but its omnigraph.yaml source goes).
• An entire class of documentation ("which file does X go in?") and the #139 security surface (a checkout cannot hijack what no longer loads).

Relationship to RFC-007 and RFC-002

RFC-007 ships the operator layer this RFC migrates to; its "project layer" language should be read as transitional — after this RFC, the project layer is the cluster checkout, and RFC-007's PR 3 (project server: references) applies to cluster.yaml-adjacent operator targeting rather than to omnigraph.yaml. RFC-002's locator/state-layer work, if resumed, targets the two-surface world directly. RFC-002's file-naming decisions (~/.omnigraph/ as the one dir) are unaffected.

Open questions

• Window length: one minor release between warn (stage 1) and strict (stage 4), or two? Cookbooks, skills, and the deployment docs all need the same pass; the migration command makes a short window defensible.
• omnigraph login vs config migrate ordering — both write ~/.omnigraph/; whichever lands first establishes the file-locking and atomic-write helpers the other reuses.
• Does the MCP server config (RFC-003) reference omnigraph.yaml anywhere that needs the same treatment? To be audited in stage 1.