Feature Specification: [Feature Name]¶

Metadata¶

Status: Draft | Approved | Implemented Author: [name] Date: YYYY-MM-DD Related PRD: [link] Related ADR: [link]

Overview¶

[1–3 sentences. What does this feature do? Who is affected? What is the system-level outcome? No why, no metrics — just what the system must do.]

Business Rules¶

Rule 1¶

[State the rule precisely. Use exact values, not approximations.]

Rule 2¶

[Each rule is independently testable. If a rule has exceptions, list them here.]

Rule 3¶

[Order rules from most to least critical.]

Functional Requirements¶

FR-1: [Short name]¶

[Describe what the system must do. Use "must", "must not", "should".]

FR-2: [Short name]¶

[Be specific about inputs, conditions, and outputs.]

FR-3: [Short name]¶

[If a requirement has sub-conditions, list them as bullets.]

API Changes¶

New Endpoints¶

[METHOD] [/path]¶

Description: [What this endpoint does]

Auth: Required (JWT Bearer) | Public Rate limit: [e.g., 10 req/min per user] | None

Request

{
  "field": "type"
}

Response — Success

{
  "status": "SUCCESS",
  "data": {
    "field": "value"
  }
}

Uses ResultObjectInfo<T> wrapper. For lists, use ResultListInfo<T>.

Response — Error

HTTP Status	Code	Message	Condition
400	`INVALID_REQUEST`	[message]	[when]
401	`UNAUTHORIZED`	[message]	Missing or invalid JWT
409	`[ERROR_CODE]`	[message]	[when]
429	`RATE_LIMITED`	[message]	Rate limit exceeded

Modified Endpoints¶

[METHOD] [/path]¶

Change: [What changed and why]

Before:

{}

After:

{}

Database Changes¶

New Tables¶

CREATE TABLE [table_name] (
    id          UUID        PRIMARY KEY DEFAULT gen_random_uuid(),
    -- columns
    created_at  TIMESTAMPTZ NOT NULL DEFAULT now()
);
CREATE INDEX idx_[table]_[column] ON [table_name]([column]);

Migration file: api/src/main/resources/db/changelog/sql/YYYYMMDDHHMM-[description].sql

Modified Tables¶

Table	Change	Column	Type	Notes
[table]	Add column	[column]	[type]	[nullable/default]
[table]	Add index	[column]	—	[reason]

No Changes¶

[State explicitly if no DB changes are needed — removes ambiguity.]

Security Requirements¶

Authentication¶

[Which endpoints require JWT? Which are public?]

Authorization¶

[Role checks if any. e.g., "Only ADMIN role can call DELETE /admin/users/{id}"]

Data Validation¶

Field	Rule	Error
[field]	[constraint, e.g., not null, max 100 chars]	[error code]

Sensitive Data¶

[Any fields that must be masked in logs via @AuditLog? List them.]

Caching Impact¶

[Does this feature read from or write to Guava LRU cache?]

Cache	Impact	Action
[CacheName]	Reads / Writes / Invalidates	[What must happen]

If no cache impact: state "No cache impact."

Frontend Changes¶

New Routes¶

Path	Component	Auth Required
`/[path]`	`[ComponentName].jsx`	Yes / No

Modified Components¶

Component	File	Change
[ComponentName]	`webapp/src/...`	[What changes]

State Management¶

[New React Query keys? New API calls? Cache invalidation strategy?]

// Query key convention
['resource', 'filter']

// Invalidate on mutation
queryClient.invalidateQueries(['resource'])

Event / Job Changes¶

Domain Events¶

Event	Change	Schema
[EventName]	New / Modified / No change	[Link or inline]

Scheduled Jobs¶

[Any AppScheduler changes? If none, state explicitly.]

Non-Functional Requirements¶

Performance¶

Operation	Target	Notes
[Endpoint]	< [X] ms p99
[Query]	< [X] ms	With index on [column]

Availability¶

[Any degradation risk to existing flows? What is the rollback path?]

Scalability¶

[Any concern at scale? e.g., "Works within 500-item user cap."]

Edge Cases¶

EC-1: [Short description]¶

Condition: [Exact input or system state] Expected: [Exact system behavior]

EC-2: [Short description]¶

Condition: [Exact input or system state] Expected: [Exact system behavior]

EC-3: Concurrent requests¶

Condition: Two requests from the same user arrive simultaneously. Expected: [One succeeds / Both fail / Idempotent — pick one and state it explicitly]

Acceptance Criteria¶

[ ] [Testable statement. Start with a verb. "User can...", "System rejects...", "Response contains..."]
[ ] [Each criterion maps to at least one FR or Business Rule above]
[ ] [Edge cases EC-1, EC-2, EC-3 are covered by integration tests]
[ ] Existing flows are unaffected (regression)
[ ] API response matches contract defined in this spec
[ ] mvn verify passes with coverage gate met
[ ] npm run test passes

Open Questions¶

[ ] [Any unresolved decisions that block implementation]
[ ] [Escalate to architect or product if needed]

Version History¶

Version	Date	Author	Change
1.0	YYYY-MM-DD	[name]	Initial draft