feat(mcp-server): typed fields for agents (RFC-0041 step 4) - #97

Step 4 of RFC-0041's rollout (ADR-0043), built on #94–#96.

Tools (105 → 109)

• list_collections: a new locale input; returns fields and fieldsSchema (fieldsJsonSchema) for collections that define fields.
• create_entry / update_entry: fields are checked in precheck, so invalid output never reaches the person approving. The checks cover changed keys only, unknown keys, non-localized values on translations, requiredToPublish when the target is review or published, and assets in the same site. Refusals carry details.issues with paths.
• update_entry: takes fields as a merge patch (null removes a key), and its approval prompt lists the typed changes readably.
• update_collection: takes fields. The store's guard runs in a dry run, so risky edits are refused with field_change_needs_operation and a hint naming the operation tools.
• New: rename_field, change_field_type, set_field_localized, remove_field.
  • Scopes site:write + content:write, approverScopes: ["site:settings"], requiresApproval; they wait for a person in every mode, bypass included. No new scopes.
  • The approval prompt is built from the dry run: counts, samples and a theme warning.
  • Continuing an unfinished operation (operationId) needs a new approval (ADR-0043 Q9). dryRun with an operationId returns the status.
• Agent guidance: hints for every field error code, and a "Typed fields" paragraph in the server instructions.

Tests

• mcp-server: 159/159, 9 of them new.
• agent-runtime: 72/72.
• API: mcp and approver-scopes tests pass.
• CLI: e2e and media tests pass.
• Typecheck, size check and the MCP doc check are clean.

Follow-ups

• The asset check is reimplemented in mcp-server, mirroring the store's rules. It should move to one shared helper.
• RFC §5's translation tools: get_translation_source should return only localized values, and save_translation should refuse non-localized ones. The store already refuses them (field_not_localized).
• create_collection doesn't take fields; adding them to a new collection takes a second approved call.

Changeset: minor (mcp-server).

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