Code diff Document a small behavior change in a code review or changelog. All values are illustrative example data. Add a bounded timeout Unified diff · request.ts 1 const response = await fetch(url, { 2 - method: "GET", 3 + method: "GET", 4 + signal: AbortSignal.timeout(5000), 5 }); 6 7 return response.json(); Customize ↗ Explain a change through added and removed lines.
Developer surfaces Edit 98/100 Editorial baseline
Terminal transcript Show a short command-line workflow with expected output. All values are illustrative example data. Run the first build Transcript · commands are examples, not executed 1 $ npm run build 2 > diagrams@0.1.0 build 3 > astro check && astro build 4 5 ✓ Type check complete 6 ✓ Static pages generated 7 Build finished. Customize ↗ Present commands and their output as readable text.
Developer surfaces Edit 98/100 Editorial baseline
Trace waterfall Locate a slow operation within one request trace. All values are illustrative example data. Where the request spends time Synthetic trace · milliseconds 0 100 200 300 400 HTTP request 400 ms Authentication 52 ms Database query 228 ms Serialize 72 ms Customize ↗ Compare span start times and durations.
Sequences Edit 84/100 Editorial baseline
Annotated code Explain one function and highlight its important return value. All values are illustrative example data. A typed response TypeScript · example source 1 type Result = { id: string }; 2 3 async function read(id: string) { 4 const response = await fetch(`/api/${id}`); 5 return response.json() as Promise<Result>; 6 } Return the parsed JSON with a declared result type. Customize ↗ Pair a short code sample with an explanation.
Developer surfaces Edit 98/100 Editorial baseline
Processing pipeline Explain how input passes through a sequence of processing stages. All values are illustrative example data. From source to searchable A four-stage ingestion pipeline Extract files + URLs 01 Normalize clean text 02 Embed vectors 03 Index search ready 04 Input: documents Output: search index Customize ↗ Walk through ordered transformations.
Flows Edit 96/100 Editorial baseline
Horizontal bar chart Rank comparable counts with a zero baseline. All values are illustrative example data. Requests by endpoint Illustrative count · zero baseline /search 480 /documents 352 /events 256 /users 128 Customize ↗ Compare categories on a shared baseline.
Charts Edit 92/100 Editorial baseline
Request sequence Explain an API request, database lookup, and response. All values are illustrative example data. Read a saved document Time runs down the page Client API Database GET /documents/42 SELECT document row 200 OK + JSON Customize ↗ Follow messages between participants over time.
Sequences Edit 88/100 Editorial baseline
HTTP exchange Explain an endpoint with headers, status, and a short payload. All values are illustrative example data. Create a document HTTP exchange · illustrative payload Request Response 1 POST /v1/documents 2 Content-Type: application/json 3 4 { 5 "title": "Architecture" 6 } 1 HTTP/1.1 201 Created 2 Content-Type: application/json 3 4 { 5 "id": "doc_42", 6 "title": "Architecture" 7 } Customize ↗ Put a request next to its response.
Developer surfaces Edit 95/100 Editorial baseline
Service architecture Explain a request moving from a client through services to storage. All values are illustrative example data. A request, end to end HTTPS → application → persistence Application boundary Web client browser API gateway /v1/events Postgres primary store Queue async jobs request write publish Customize ↗ Show the boundaries and connections in a small system.
Architecture Edit 94/100 Editorial baseline
Entity relationship Document a compact relational schema with cardinality labels. All values are illustrative example data. A small relational model One user has many documents users documents id uuid PK email text created_at timestamp id uuid PK user_id uuid FK body text 1 N Customize ↗ Explain tables, keys, and their relationships.
Data structures Edit 83/100 Editorial baseline
Release timeline Explain ordered release milestones without implying precise durations. All values are illustrative example data. A release in four milestones Ordinal milestones · spacing is not duration Spec Sep 08 Build Sep 12 Review Sep 16 Release Sep 19 Customize ↗ Place milestones along a readable horizontal track.
Time & planning Edit 95/100 Editorial baseline
Editor with file tree Orient a reader in a small project and explain one file. All values are illustrative example data. Find the renderer Illustrative editor layout · not an executable IDE src/ lib/ scene.ts catalog.ts pages/ index.astro package.json scene.ts 1 export function render( 2 scene: Scene, 3 options: Options 4 ) { 5 return toSVG(scene); 6 } Customize ↗ Show how source files relate to the active code.
Developer surfaces Edit 90/100 Editorial baseline
Line chart Show a metric changing over time with labeled units. All values are illustrative example data. Request latency over time Illustrative p95 latency · milliseconds 0 100 200 300 09:00 10:00 11:00 12:00 p95 Customize ↗ Compare a measured value over an ordered axis.
Charts Edit 87/100 Editorial baseline
Decision flow Explain one decision and the two paths that follow. All values are illustrative example data. Validate before accepting Request validation Request Valid? schema + auth Accept Reject yes no Customize ↗ Branch a process around an explicit condition.
Flows Edit 86/100 Editorial baseline
Structured logs Explain how log events reveal a single request failure. All values are illustrative example data. Follow one request through the logs Synthetic events · request_id=req_42 09:41:02.101 INFO request received 09:41:02.105 INFO auth verified 09:41:02.118 WARN cache miss 09:41:02.204 ERROR upstream timeout 09:41:02.206 INFO retry scheduled 09:41:03.244 INFO request completed Customize ↗ Make a short diagnostic sequence scannable.
Developer surfaces Edit 97/100 Editorial baseline
Layered stack Explain which layer owns presentation, business rules, and storage. All values are illustrative example data. Application layers Each layer has one responsibility Presentation React · HTTP Application Use cases · policies Domain Entities · invariants Infrastructure Postgres · S3 Customize ↗ Separate a system into responsibilities.
Architecture Edit 96/100 Editorial baseline
Git branches Explain one feature branch merging into main. All values are illustrative example data. A feature branch, merged Commit order runs left to right main feature/search merge Customize ↗ Follow commits and a merge across branches.
Time & planning Edit 85/100 Editorial baseline
Test results Illustrate a test run and call attention to one failure. All values are illustrative example data. Read the failing case Illustrative test report PASS escapes user-supplied labels PASS renders all catalog recipes FAIL rejects an invalid radius PASS preserves the scene title Expected: a positive number. Received: -4. Customize ↗ Summarize test cases with readable outcomes.
Developer surfaces Edit 97/100 Editorial baseline
Async fan-out Explain parallel consumers and their individual acknowledgements. All values are illustrative example data. Publish once, handle independently Parallel event consumers Order placed event Send receipt consumer 1 Reserve stock consumer 2 Update metrics consumer 3 Customize ↗ Show one event starting independent operations.
Sequences Edit 83/100 Editorial baseline
State machine Explain a job moving through queued, running, and terminal states. All values are illustrative example data. The lifecycle of a job Events are labels on transitions Queued Running Complete start finish reprocess Customize ↗ Name valid states and the events that change them.
Flows Edit 82/100 Editorial baseline
Gantt chart Explain overlapping tasks with planned start and end dates. All values are illustrative example data. Delivery plan Illustrative schedule · September 08 10 12 14 16 18 Scope Implement Test Publish Customize ↗ Compare scheduled work on a shared time axis.
Time & planning Edit 82/100 Editorial baseline
File tree Help a reader find the file they should edit. All values are illustrative example data. A small, navigable project Paths relative to the repository root 1 project/ 2 ├── src/ 3 │ ├── lib/ # primitives + recipes 4 │ └── pages/ # gallery + reference 5 ├── public/ # static assets 6 ├── tests/ # rendering contracts 7 └── tokens.css # shared visual tokens Customize ↗ Document the location and purpose of project files.
Developer surfaces Edit 99/100 Editorial baseline
Relationship matrix Show which roles can perform which actions. All values are illustrative example data. Role permissions A check means the action is allowed Read Write Invite Delete Viewer ✓ · · · Editor ✓ ✓ · · Owner ✓ ✓ ✓ ✓ Customize ↗ Compare relationships across two sets.
Data structures Edit 94/100 Editorial baseline
Deployment topology Document redundancy across two availability zones. All values are illustrative example data. One region, two zones eu-west · example deployment Load balancer public ingress Availability zone 1 Application 2 replicas private subnet Availability zone 2 Application 2 replicas private subnet Customize ↗ Group running services by region and zone.
Architecture Edit 82/100 Editorial baseline
Dependency graph Explain a small directed acyclic build graph. All values are illustrative example data. Build prerequisites Arrows point to the dependent task Install Typecheck Unit tests Publish Customize ↗ Show prerequisites and parallel work.
Time & planning Edit 79/100 Editorial baseline
Swimlane process Show handoffs between a user, API, and worker. All values are illustrative example data. Who does what Upload and process a document User API Worker Upload Enqueue Process Customize ↗ Assign each action to an owner.
Flows Edit 78/100 Editorial baseline
Hub and spoke Show clients connected to a single event bus or platform. All values are illustrative example data. An event bus and its consumers One transport, independent services Event bus Billing Search Analytics Notifications Customize ↗ Put one shared dependency at the center.
Architecture Edit 87/100 Editorial baseline
Heatmap Scan relative workload by day and time bucket. All values are illustrative example data. When the queue is busiest Illustrative jobs per bucket · values shown Mon 2 7 1 4 8 3 6 2 Tue 5 0 4 7 1 6 9 5 Wed 8 3 7 0 4 9 2 8 Thu 1 6 0 3 7 2 5 1 Fri 4 9 3 6 0 5 8 4 00 03 06 09 12 15 18 21 Customize ↗ Reveal concentration across a two-dimensional grid.
Charts Edit 84/100 Editorial baseline
Object tree Explain a JSON document or nested configuration structure. All values are illustrative example data. The shape of a document JSON structure · field types 1 document 2 ├── id: string 3 ├── title: string 4 ├── author 5 │ ├── id: string 6 │ └── name: string 7 └── tags: string[] Customize ↗ Expand a hierarchy without losing parent context.
Data structures Edit 95/100 Editorial baseline
Retry with backoff Document a capped retry policy for a transient failure. All values are illustrative example data. Retry a transient failure Three attempts · illustrative timing Worker Upstream Attempt 1 → 503 Wait 1 s → 503 Wait 2 s → 200 Customize ↗ Show failed attempts and increasing wait intervals.
Sequences Edit 90/100 Editorial baseline
Linked list Teach next pointers or a simple chain of records. All values are illustrative example data. Follow the next pointer A singly linked list alpha beta gamma head ∅ value next Customize ↗ Show pointers and a terminal value.
Data structures Edit 94/100 Editorial baseline
Donut chart Show one dominant proportion and its complement. All values are illustrative example data. Cache outcomes Illustrative sample · 100 requests 80% cache hits Hit 80 Miss 20 Use for rough proportions. Customize ↗ Show a small number of parts of a whole.
Charts Edit 75/100 Editorial baseline