# AGENTS.md — Build guide for Wanderlog Pro

## Project scope
Plan a trip from entered places and reservations, order stops by day and view them on a configured MapLibre map. Export a portable itinerary with essential addresses and notes for offline use.

Catalogue verdict: kinda. The core loop is buildable, but a dependable replacement becomes a real weekend or multi-day project. For Wanderlog Pro, build a collaborative itinerary from user-entered places, notes, and reservations. The hard boundary is maps, travel data, collaboration, offline access, route optimization, and mobile apps, plus proprietary live data and network coverage.
Use the implementation prompt below to define the deliverable. Complete each phase's acceptance checks before extending the scope.

## Working agreement
- Inspect the repository and its existing instructions before choosing paths, dependencies or commands. Keep one coherent stack and explain changes to the proposed architecture.
- Plan a vertical slice that accepts a real input and produces the useful output described below. Persist only the state the prompt calls for; respect memory-only and upstream-managed workflows. Use fixtures only when they are clearly labelled.
- After scaffolding, document the actual install, development, check and build commands in README and keep them synchronized with the package or project manifest. Do not report commands as successful unless they ran.
- Work in small steps. At handoff, list implemented flows, checks actually performed, remaining blockers, and any credentials or provider setup the owner must supply.
- Do not publish, spend money, contact customers, delete source data or run irreversible migrations without the project owner's authorization.

## Prerequisites
- A supported Node release, a writable local data directory and a separate backup location. Bind to localhost; remote use requires authentication and HTTPS first. User-entered travel details and authorized map/geocoding access; a shared deployment requires authentication and revision checks.
- Implementation components: Node.js, TypeScript and Express with server-rendered HTML and small browser modules. SQLite through better-sqlite3 with migrations, prepared statements and a single background worker. MapLibre GL with a separately licensed/configured tile and geocoding source; a textual itinerary remains the offline fallback.
- Scope boundary: maps, travel data, collaboration, offline access, route optimization, and mobile apps; live fare and inventory data

## Stack and architecture
- Node.js, TypeScript and Express with server-rendered HTML and small browser modules.
- SQLite through better-sqlite3 with migrations, prepared statements and a single background worker.
- MapLibre GL with a separately licensed/configured tile and geocoding source; a textual itinerary remains the offline fallback.
- Domain model: trips, dated itinerary items, user-entered places, reservations, map references and offline export snapshots

## Security and data integrity
- Reject unexpected origins and unbounded request bodies even on localhost. Keep credentials outside the database export and redact sensitive text from logs.
- Correctness boundary: Map tiles/geocoding require an authorized source; opening hours, travel time and availability remain source-dated or user-entered rather than presented as live facts.
- Use short SQLite transactions and persist job state before starting work. Give retries stable operation IDs; report incomplete or unknown results instead of silently repeating them.
- Use a consistent SQLite backup and an attachment manifest. Export portable JSON/CSV, then restore to a new directory without overwriting the original data.

## Agent implementation rules
- Project rule — data model: trips, dated itinerary items, user-entered places, reservations, map references and offline export snapshots
- Project rule — preserve this invariant: Map tiles/geocoding require an authorized source; opening hours, travel time and availability remain source-dated or user-entered rather than presented as live facts.
- Project rule — acceptance evidence: An unavailable map service leaves the textual itinerary usable; two travelers editing the same item receive a conflict instead of losing a reservation note.

## Optional agent skills and references
- Optional external skill: [web-design-guidelines](https://github.com/vercel-labs/agent-skills/blob/main/skills/web-design-guidelines/SKILL.md) — Review web interfaces for accessibility, keyboard focus, forms, navigation and interaction quality. Review its instructions and compatibility before use; it does not grant deployment, data-access or publication permission.
- Optional external skill: [sharp-edges](https://github.com/trailofbits/skills/blob/main/plugins/sharp-edges/skills/sharp-edges/SKILL.md) — Review security-sensitive APIs and configuration for dangerous defaults and easy-to-misuse interfaces. Review its instructions and compatibility before use; it does not grant deployment, data-access or publication permission.

Read the linked SKILL.md and its dependencies before adding a skill. Select only the skills matching this project's runtime and task; their documentation does not supply API access, credentials or approval to perform external actions. Pin the reviewed revision where the tool supports it. Follow the chosen agent's documented project-level installation mechanism.

## Distribution ideas
These are optional planning notes. Obtain the owner's approval before publishing or contacting anyone.
- Demonstrate the actual Wanderlog Pro-inspired workflow with owned or clearly labeled sample data: Plan a trip from entered places and reservations, order stops by day and view them on a configured MapLibre map. Export a portable itinerary with essential addresses and notes for offline use.
- Publish a reproducible walkthrough with this observable result: An unavailable map service leaves the textual itinerary usable; two travelers editing the same item receive a conflict instead of losing a reservation note.
- Explain who can operate this scoped tool, its setup and ongoing costs, and these remaining product gaps: maps, travel data, collaboration, offline access, route optimization, and mobile apps; live fare and inventory data Avoid guaranteed savings, performance scores or implied endorsement.

## Engineering roadmap
1. Phase 1 — Scope and fixtures. Implement this bounded workflow: Plan a trip from entered places and reservations, order stops by day and view them on a configured MapLibre map. Export a portable itinerary with essential addresses and notes for offline use. Record prerequisites, select representative user-owned fixtures and document the unsupported features: maps, travel data, collaboration, offline access, route optimization, and mobile apps; live fare and inventory data
2. Phase 2 — Durable model. Model trips, dated itinerary items, user-entered places, reservations, map references and offline export snapshots Add migrations or a versioned document format, explicit validation, stable IDs and a visible import-error report. Preserve this rule: Map tiles/geocoding require an authorized source; opening hours, travel time and availability remain source-dated or user-entered rather than presented as live facts.
3. Phase 3 — Complete the first useful path. Implement the workflow's input, review and output interface, with clear controls and explicit empty/error states. Use short SQLite transactions and persist job state before starting work. Give retries stable operation IDs; report incomplete or unknown results instead of silently repeating them.
4. Phase 4 — Permissions and integration failure. Reject unexpected origins and unbounded request bodies even on localhost. Keep credentials outside the database export and redact sensitive text from logs. Request integration credentials and permissions only for the enabled feature; show a disconnected state instead of mock results.
5. Phase 5 — Portable handoff. Use a consistent SQLite backup and an attachment manifest. Export portable JSON/CSV, then restore to a new directory without overwriting the original data. Include setup, operating limits, fixture walkthrough and shutdown/restart instructions in the README.
6. Phase 6 — Acceptance scenarios. An unavailable map service leaves the textual itinerary usable; two travelers editing the same item receive a conflict instead of losing a reservation note. Repeat the workflow after restart and with a denied permission or unavailable dependency; show recoverable failure rather than a success placeholder.

## Paid-product capabilities outside this build
- maps, travel data, collaboration, offline access, route optimization, and mobile apps
- live fare and inventory data
- global routing dataset
- crowdsourced trail intelligence
- booking, disruption support, and offline map fleet

## Implementation prompt
WORKING SLICE
Plan a trip from entered places and reservations, order stops by day and view them on a configured MapLibre map. Export a portable itinerary with essential addresses and notes for offline use.

Build this scoped Wanderlog Pro-inspired workflow with a documented data model and visible failure states.

Architecture
- Node.js, TypeScript and Express with server-rendered HTML and small browser modules.
- SQLite through better-sqlite3 with migrations, prepared statements and a single background worker.
- MapLibre GL with a separately licensed/configured tile and geocoding source; a textual itinerary remains the offline fallback.

Prerequisites and limits
A supported Node release, a writable local data directory and a separate backup location. Bind to localhost; remote use requires authentication and HTTPS first. User-entered travel details and authorized map/geocoding access; a shared deployment requires authentication and revision checks.
Outside this release: maps, travel data, collaboration, offline access, route optimization, and mobile apps; live fare and inventory data

Data model and correctness
trips, dated itinerary items, user-entered places, reservations, map references and offline export snapshots
Invariant: Map tiles/geocoding require an authorized source; opening hours, travel time and availability remain source-dated or user-entered rather than presented as live facts.
Use short SQLite transactions and persist job state before starting work. Give retries stable operation IDs; report incomplete or unknown results instead of silently repeating them.

Security and privacy
Reject unexpected origins and unbounded request bodies even on localhost. Keep credentials outside the database export and redact sensitive text from logs.

Recovery and export
Use a consistent SQLite backup and an attachment manifest. Export portable JSON/CSV, then restore to a new directory without overwriting the original data.

Implementation order
1. Phase 1 — Scope and fixtures. Implement this bounded workflow: Plan a trip from entered places and reservations, order stops by day and view them on a configured MapLibre map. Export a portable itinerary with essential addresses and notes for offline use. Record prerequisites, select representative user-owned fixtures and document the unsupported features: maps, travel data, collaboration, offline access, route optimization, and mobile apps; live fare and inventory data
2. Phase 2 — Durable model. Model trips, dated itinerary items, user-entered places, reservations, map references and offline export snapshots Add migrations or a versioned document format, explicit validation, stable IDs and a visible import-error report. Preserve this rule: Map tiles/geocoding require an authorized source; opening hours, travel time and availability remain source-dated or user-entered rather than presented as live facts.
3. Phase 3 — Complete the first useful path. Implement the workflow's input, review and output interface, with clear controls and explicit empty/error states. Use short SQLite transactions and persist job state before starting work. Give retries stable operation IDs; report incomplete or unknown results instead of silently repeating them.
4. Phase 4 — Permissions and integration failure. Reject unexpected origins and unbounded request bodies even on localhost. Keep credentials outside the database export and redact sensitive text from logs. Request integration credentials and permissions only for the enabled feature; show a disconnected state instead of mock results.
5. Phase 5 — Portable handoff. Use a consistent SQLite backup and an attachment manifest. Export portable JSON/CSV, then restore to a new directory without overwriting the original data. Include setup, operating limits, fixture walkthrough and shutdown/restart instructions in the README.
6. Phase 6 — Acceptance scenarios. An unavailable map service leaves the textual itinerary usable; two travelers editing the same item receive a conflict instead of losing a reservation note. Repeat the workflow after restart and with a denied permission or unavailable dependency; show recoverable failure rather than a success placeholder.

Acceptance
An unavailable map service leaves the textual itinerary usable; two travelers editing the same item receive a conflict instead of losing a reservation note.
Use real source data or clearly labeled fixtures. Explain unsupported input and provider failures; do not fabricate analytics, delivery receipts, accuracy claims or security guarantees.

Optional agent guidance
Optional external skill: [web-design-guidelines](https://github.com/vercel-labs/agent-skills/blob/main/skills/web-design-guidelines/SKILL.md) — Review web interfaces for accessibility, keyboard focus, forms, navigation and interaction quality. Review its instructions and compatibility before use; it does not grant deployment, data-access or publication permission.
Optional external skill: [sharp-edges](https://github.com/trailofbits/skills/blob/main/plugins/sharp-edges/skills/sharp-edges/SKILL.md) — Review security-sensitive APIs and configuration for dangerous defaults and easy-to-misuse interfaces. Review its instructions and compatibility before use; it does not grant deployment, data-access or publication permission.
Project rule — data model: trips, dated itinerary items, user-entered places, reservations, map references and offline export snapshots
Project rule — preserve this invariant: Map tiles/geocoding require an authorized source; opening hours, travel time and availability remain source-dated or user-entered rather than presented as live facts.
Project rule — acceptance evidence: An unavailable map service leaves the textual itinerary usable; two travelers editing the same item receive a conflict instead of losing a reservation note.

## Completion evidence
Demonstrate the prompt's acceptance scenarios against the scoped workflow. Include setup from a clean checkout and failure recovery. Check persistence across restart and export/restore only for the state the prompt says to store; for memory-only tools, confirm that temporary content is discarded as specified. Record actual results and remaining limitations. A detailed plan alone does not establish a working replacement.