MtoRagSystem/DEVELOPER_POLICIES.md

RetrieX Developer Policies

Status: binding after completion of the YAML-only migration through Patch 11.0a.

These policies protect the stable RetrieX configuration architecture. They are intentionally operational and must be followed by developers before a change is merged.

1. Source of truth

The functional configuration source of truth is YAML under config/retriex/.

This applies especially to:

• vocabulary, synonyms, stopwords and token lists
• intent rules and commerce routing
• search repair and query enrichment rules
• prompt texts, labels, output-priority rules and grounding rules
• agent messages, source labels, status messages and templates
• retrieval thresholds, token groups and scoring-related rule lists
• shop matching and commerce query parsing rules
• model and index defaults

PHP classes may read and validate these values, but must not silently redefine them.

2. No new PHP-only defaults

New configurable values must be added in YAML first.

Required pattern:

1. Add the value to the matching file in config/retriex/.
2. Wire the value through config/services.yaml when constructor injection is needed.
3. Expose/read it through the matching src/Config/*Config.php class.
4. Keep mto:agent:config:validate green.
5. Keep mto:agent:config:audit-source --details free of missing YAML mappings.

Not allowed:

• new constructor defaults that act as business or answer logic
• new hardcoded keyword lists in src/
• new PHP-only constants for semantic or product-specific behavior
• hidden fallbacks that change retrieval, prompt, shop or intent behavior when YAML is incomplete

3. Allowed technical constants

Technical constants are allowed only when they are not business, prompt, retrieval, product, intent or shop semantics.

Examples that may be acceptable:

• internal status strings
• command exit handling
• filesystem mode details
• non-semantic implementation identifiers

If a constant influences answer quality, matching, routing, scoring, prompt behavior or shop behavior, it belongs in YAML.

4. Fallback policy

Fallbacks are not a normal extension mechanism.

A fallback is only acceptable when all conditions are met:

• the value has a YAML path or explicit service-parameter mapping
• the fallback is documented as defensive infrastructure behavior
• the audit does not report it as missing YAML mapping
• the fallback cannot change semantic answer behavior in normal operation

If in doubt, move the value to YAML.

5. Required checks before merge

Every change touching src/Config, config/retriex, prompt, retrieval, intent, commerce, shop matching, SSE/job completion or answer grounding must run:

php bin/console cache:clear
php bin/console mto:agent:config:validate
php bin/console mto:agent:config:audit-source --details
php bin/console mto:agent:regression:test

Expected result:

• config validation: OK
• regression baseline: OK
• source audit: no missing YAML mappings
• no new undocumented PHP-only semantic constants
• no new constructor defaults without YAML/service-parameter mapping

6. Protected regression baseline

The following behavior must not regress:

• lowest water-hardness limit remains 0,02 deg dH for Testomat 808
• follow-up indicator answer remains focused on indicator type 300
• accessory price follow-up for indicator type 300 returns the matching indicator products, not device prices
• history-based shop follow-up such as suche im shop keeps the relevant product context
• advisory product questions may use shop/catalog fallback when RAG knowledge is insufficient
• SSE/job completion must close loader/think states reliably, including reconnect/watchdog cases

Offline checks are covered by mto:agent:regression:test. End-to-end behavior still needs manual or integration verification when the touched code path is not covered offline.

7. Strict YAML validation

Strict YAML validation remains intentionally deferred.

Until a later patch explicitly enables it, developers must enforce these policies through:

• code review
• mto:agent:config:validate
• mto:agent:config:audit-source --details
• mto:agent:regression:test

Strict mode must remain configurable and disabled by default when it is introduced later.

8. Pull request checklist

Use this checklist for every relevant PR:

• All new configurable behavior is in config/retriex/*.yaml.
• No new semantic keyword/token/prompt list was added directly to PHP.
• No new constructor default was added without YAML/service-parameter mapping.
• mto:agent:config:validate is OK.
• mto:agent:config:audit-source --details has no missing YAML mappings.
• mto:agent:regression:test is OK.
• The protected functional flows were manually checked if the touched area can affect them.
• README or patch README documents the reason for any intentionally accepted technical fallback.