{ "policy": { "version": 5, "patterns": { "version": 1, "method": "CURATED_PRACTICE_TOPIC", "notice": "Pattern topics identify design choices to practice. Read the ticket's acceptance criteria and justify the simplest suitable approach. Tags are not capability or ownership evidence; an untagged ticket has no curated pattern topic assigned." }, "fieldMix": { "version": 1, "method": "CURATED_ESTIMATE", "notice": "Field percentages are editorial estimates of the ticket's engineering focus. They total 100%; they are not measured time, proficiency scores, or ownership evidence." }, "contentStatus": "PRACTICE_BRIEF", "assessmentStatus": "NOT_QUALIFIED", "evidenceUse": "NONE", "aiPolicy": "AI tools are welcome during implementation. Record assumptions, review the result, and verify its behavior.", "notice": "Fictional engineering practice briefs. Starter repositories, fixtures, automated grading, and verified ownership are not included.", "outcomeEvidence": "Tests, patches, and runbooks are requested deliverables. They become Outcome Evidence only through a qualified Mission and immutable Evidence IDs.", "ownershipEvidence": "Independent adaptation must be observed under a declared verification policy and cite immutable Evidence IDs. Completing a planning ticket establishes no Ownership Evidence." }, "patternTopics": [ { "id": "factory-method", "label": "Factory Method", "group": "Creational" }, { "id": "abstract-factory", "label": "Abstract Factory", "group": "Creational" }, { "id": "builder", "label": "Builder", "group": "Creational" }, { "id": "prototype", "label": "Prototype", "group": "Creational" }, { "id": "singleton", "label": "Singleton", "group": "Creational" }, { "id": "adapter", "label": "Adapter", "group": "Structural" }, { "id": "bridge", "label": "Bridge", "group": "Structural" }, { "id": "composite", "label": "Composite", "group": "Structural" }, { "id": "decorator", "label": "Decorator", "group": "Structural" }, { "id": "facade", "label": "Facade", "group": "Structural" }, { "id": "flyweight", "label": "Flyweight", "group": "Structural" }, { "id": "proxy", "label": "Proxy", "group": "Structural" }, { "id": "chain-of-responsibility", "label": "Chain of Responsibility", "group": "Behavioral" }, { "id": "command", "label": "Command", "group": "Behavioral" }, { "id": "interpreter", "label": "Interpreter", "group": "Behavioral" }, { "id": "iterator", "label": "Iterator", "group": "Behavioral" }, { "id": "mediator", "label": "Mediator", "group": "Behavioral" }, { "id": "memento", "label": "Memento", "group": "Behavioral" }, { "id": "observer", "label": "Observer", "group": "Behavioral" }, { "id": "state", "label": "State", "group": "Behavioral" }, { "id": "strategy", "label": "Strategy", "group": "Behavioral" }, { "id": "template-method", "label": "Template Method", "group": "Behavioral" }, { "id": "visitor", "label": "Visitor", "group": "Behavioral" }, { "id": "ports-and-adapters", "label": "Ports and Adapters", "group": "Architectural" }, { "id": "cqrs", "label": "CQRS", "group": "Architectural" }, { "id": "strangler-fig", "label": "Strangler Fig", "group": "Architectural" }, { "id": "saga", "label": "Saga", "group": "Distributed and reliability" }, { "id": "transactional-outbox", "label": "Transactional Outbox", "group": "Distributed and reliability" }, { "id": "circuit-breaker", "label": "Circuit Breaker", "group": "Distributed and reliability" }, { "id": "bulkhead", "label": "Bulkhead", "group": "Distributed and reliability" } ], "projects": [ { "id": "5e342e68-06ac-450f-97dc-2882570fedea", "key": "CLINK", "title": "Mobile invitation and session navigation", "field": "Mobile", "summary": "Handle deep links, expired sessions, and interrupted navigation using local identity stubs.", "context": "Fictional team-planning app Finch opens invitations and shared work items. All users and sessions are synthetic; implement the app in an emulator without external identity credentials.", "stack": [ "React Native", "TypeScript", "Emulator", "Testing Library" ], "prerequisites": [ "Create a local session adapter with expiry and revocation.", "Define synthetic invitation and work-item links." ], "developerValue": "Practice navigation state, capability checks and session boundaries.", "companyValue": "Inspect whether links remain useful without bypassing authorization.", "delivery": "Deliver local navigation behaviors; real identity integrations remain separate.", "phases": [ { "id": "links", "title": "Parse entry points", "goal": "Establish safe route contracts." }, { "id": "sessions", "title": "Handle identity changes", "goal": "Preserve only authorized navigation intent." }, { "id": "recovery", "title": "Test interruption", "goal": "Recover process and session transitions." } ], "tickets": [ { "id": "94ab1322-3e8e-4767-8a36-0fa4f6ce1394", "key": "CLINK-101", "title": "Reject malformed mobile invitation routes before navigation", "type": "TASK", "priority": "HIGH", "difficulty": "FOUNDATIONAL", "estimateMinutes": 75, "phaseId": "links", "dependsOn": [], "scenario": "Pasted links with missing invitation IDs crash route construction. Add strict parsing before mounting screens.", "acceptanceCriteria": [ "Valid IDs produce typed routes", "Malformed links show a recoverable state", "Unsupported schemes are rejected" ], "implementationNotes": [ "Do not render arbitrary link text as markup." ], "verification": [ "Open valid fixture link", "Open empty and oversized IDs" ], "deliverables": [ "Link parser and invalid-input cases" ], "rollout": "Disable invitation entry while keeping home navigation.", "skills": [ "Parsing", "Navigation" ], "fieldMix": [ { "field": "Mobile", "percentage": 70 }, { "field": "Security", "percentage": 30 } ], "patterns": [] }, { "id": "bd963918-9199-4570-a221-49277c472b71", "key": "CLINK-102", "title": "Explain expired mobile invitations without automatic retries", "type": "STORY", "priority": "MEDIUM", "difficulty": "FOUNDATIONAL", "estimateMinutes": 75, "phaseId": "links", "dependsOn": [ "CLINK-101" ], "scenario": "Expired invitations spin indefinitely because the client treats every response as transient. Render terminal expiry distinctly.", "acceptanceCriteria": [ "Expiry stops retry", "User can return home", "Temporary failures retain manual retry" ], "implementationNotes": [ "Follow typed adapter error codes." ], "verification": [ "Open expired fixture", "Simulate temporary outage" ], "deliverables": [ "Invitation error states" ], "rollout": "Restore static invitation failure page if classification breaks.", "skills": [ "Error handling", "Mobile UI" ], "fieldMix": [ { "field": "Mobile", "percentage": 100 } ], "patterns": [] }, { "id": "723af4e7-3069-4d2c-9157-829e93dbec20", "key": "CLINK-103", "title": "Retain a mobile link destination through local sign-in", "type": "STORY", "priority": "MEDIUM", "difficulty": "INTERMEDIATE", "estimateMinutes": 120, "phaseId": "links", "dependsOn": [ "CLINK-101", "CLINK-102" ], "scenario": "Signing in from an invitation lands on the dashboard. Preserve a validated destination until identity is available.", "acceptanceCriteria": [ "Valid destination resumes once", "External destinations are rejected", "Cancel sign-in clears pending intent" ], "implementationNotes": [ "Store route identity, not raw credentials or URL tokens." ], "verification": [ "Sign in and resume", "Cancel then sign in normally" ], "deliverables": [ "Pending-route coordinator" ], "rollout": "Disable continuation if validation fails.", "skills": [ "Navigation", "State management" ], "fieldMix": [ { "field": "Mobile", "percentage": 80 }, { "field": "Security", "percentage": 20 } ], "patterns": [] }, { "id": "b1bcdf64-7b6a-45d1-9913-1485c742edce", "key": "CLINK-104", "title": "Recheck mobile work-item access after account switching", "type": "BUG", "priority": "HIGH", "difficulty": "ADVANCED", "estimateMinutes": 180, "phaseId": "sessions", "dependsOn": [ "CLINK-103" ], "scenario": "Switching accounts leaves the previous account's work screen visible. Clear account-scoped cache before refetching.", "acceptanceCriteria": [ "Old content clears on switch", "New identity requires authorized read", "Denied reads show no prior item data" ], "implementationNotes": [ "Account identity belongs in cache boundaries." ], "verification": [ "Switch to authorized account", "Switch to denied account" ], "deliverables": [ "Account-switch isolation and checks" ], "rollout": "Force full local session reset while repaired.", "skills": [ "Authorization", "Caching" ], "fieldMix": [ { "field": "Security", "percentage": 70 }, { "field": "Mobile", "percentage": 30 } ], "patterns": [] }, { "id": "930c4ab4-8742-4877-8b91-f73b40bb2af9", "key": "CLINK-105", "title": "Serialize mobile session refresh for simultaneous requests", "type": "TASK", "priority": "HIGH", "difficulty": "ADVANCED", "estimateMinutes": 180, "phaseId": "sessions", "dependsOn": [ "CLINK-103" ], "scenario": "Opening a linked screen triggers three refresh calls and conflicting session updates. Share one in-flight refresh.", "acceptanceCriteria": [ "Concurrent reads share refresh", "Failure releases waiting requests consistently", "Later retry can start anew" ], "implementationNotes": [ "Session tokens stay outside generic logs." ], "verification": [ "Trigger three expired reads", "Reject refresh then retry" ], "deliverables": [ "Refresh coordinator and concurrency tests" ], "rollout": "Stop automatic refresh and require explicit sign-in.", "skills": [ "Concurrency", "Authentication" ], "fieldMix": [ { "field": "Mobile", "percentage": 50 }, { "field": "Security", "percentage": 30 }, { "field": "Performance engineering", "percentage": 20 } ], "patterns": [] }, { "id": "ee8175ab-7137-4d1c-8a5c-e99dd084592e", "key": "CLINK-106", "title": "Cancel pending mobile navigation when invitation ownership changes", "type": "BUG", "priority": "HIGH", "difficulty": "INTERMEDIATE", "estimateMinutes": 135, "phaseId": "sessions", "dependsOn": [ "CLINK-104", "CLINK-105" ], "scenario": "An invitation opened before account switching completes under the wrong identity. Bind continuation to the initiating session generation.", "acceptanceCriteria": [ "Stale continuation is discarded", "Current session can reopen link", "No prior invitation details remain visible" ], "implementationNotes": [ "Cancellation must survive late adapter responses." ], "verification": [ "Resolve current invitation", "Resolve old invitation after switch" ], "deliverables": [ "Session-scoped continuation guard" ], "rollout": "Clear all pending routes on account change.", "skills": [ "Race conditions", "Isolation" ], "fieldMix": [ { "field": "Mobile", "percentage": 50 }, { "field": "Security", "percentage": 50 } ], "patterns": [] }, { "id": "fa337840-8ea6-48d4-b6d1-ddf4e6bb13dc", "key": "CLINK-107", "title": "Recover mobile sign-in continuation after process restart", "type": "STORY", "priority": "MEDIUM", "difficulty": "EXPERT", "estimateMinutes": 240, "phaseId": "sessions", "dependsOn": [ "CLINK-103", "CLINK-105" ], "scenario": "An emulator restart during local sign-in loses the requested destination. Persist minimal, expiring continuation state.", "acceptanceCriteria": [ "Valid continuation resumes once", "Expired continuation is discarded", "Unknown schema versions fail closed" ], "implementationNotes": [ "Persist no session secrets in navigation storage." ], "verification": [ "Restart before continuation", "Tamper with saved destination" ], "deliverables": [ "Versioned continuation store and restart checks" ], "rollout": "Delete continuation metadata and return home.", "skills": [ "Persistence", "Security" ], "fieldMix": [ { "field": "Mobile", "percentage": 60 }, { "field": "Security", "percentage": 40 } ], "patterns": [] }, { "id": "04218435-cda2-4bb2-a14d-88dd3c397f9b", "key": "CLINK-108", "title": "Keep the mobile Back stack free of completed sign-in screens", "type": "BUG", "priority": "MEDIUM", "difficulty": "INTERMEDIATE", "estimateMinutes": 105, "phaseId": "recovery", "dependsOn": [ "CLINK-106", "CLINK-107" ], "scenario": "After joining a team, Back returns to a completed sign-in screen that resubmits. Replace transient routes on success.", "acceptanceCriteria": [ "Back reaches prior meaningful screen", "Completed forms cannot resubmit", "Failed sign-in remains editable" ], "implementationNotes": [ "Specify stack behavior for cold and warm launches." ], "verification": [ "Complete cold-launch sign-in", "Fail then retry warm launch" ], "deliverables": [ "Stack transition and navigation tests" ], "rollout": "Reset to home after sign-in if replacement fails.", "skills": [ "Navigation", "State transitions" ], "fieldMix": [ { "field": "Mobile", "percentage": 100 } ], "patterns": [] }, { "id": "cadaefab-0a72-4a87-94bf-49411f775609", "key": "CLINK-109", "title": "Expose revoked mobile sessions before showing cached team content", "type": "BUG", "priority": "HIGH", "difficulty": "ADVANCED", "estimateMinutes": 180, "phaseId": "recovery", "dependsOn": [ "CLINK-104", "CLINK-108" ], "scenario": "A resumed app flashes old team details before learning the session was revoked. Gate sensitive cached rendering.", "acceptanceCriteria": [ "Resume enters verification state", "Revocation clears scoped cache", "Offline uncertainty has an explicit locked view" ], "implementationNotes": [ "Public shell may render without private records." ], "verification": [ "Resume valid session", "Revoke during background pause" ], "deliverables": [ "Resume gate and revocation checks" ], "rollout": "Clear private cache on every resume until fixed.", "skills": [ "Authorization", "Lifecycle" ], "fieldMix": [ { "field": "Security", "percentage": 70 }, { "field": "Mobile", "percentage": 30 } ], "patterns": [] }, { "id": "35869e79-68b9-444b-be15-3300a46da8e6", "key": "CLINK-110", "title": "Record mobile deep-link failure categories without invitation tokens", "type": "CHORE", "priority": "LOW", "difficulty": "INTERMEDIATE", "estimateMinutes": 90, "phaseId": "recovery", "dependsOn": [ "CLINK-109" ], "scenario": "Support logs raw invitation URLs while diagnosing failures. Emit categories and route types only.", "acceptanceCriteria": [ "Logs exclude IDs and tokens", "Known failures have stable categories", "Unexpected errors use bounded safe summaries" ], "implementationNotes": [ "Verify with synthetic secret-like links." ], "verification": [ "Log valid route outcome", "Reject token-bearing malformed URL" ], "deliverables": [ "Diagnostic event contract" ], "rollout": "Disable link diagnostics on redaction failure.", "skills": [ "Logging", "Data minimization" ], "fieldMix": [ { "field": "Privacy engineering", "percentage": 60 }, { "field": "Mobile", "percentage": 40 } ], "patterns": [] } ] } ] }