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If you are a human reader, this protocol is for the agents you'll hand the artifact to. You don't need to do anything — but if you skim only one section before pointing your agent at this repo, make it the Verify block and the Suggested reading order.

GO — Healthy across the board

• Last commit today
• 11 active contributors
• Distributed ownership (top contributor 43% of recent commits)
• Apache-2.0 licensed
• CI configured
• Tests present

_{Maintenance signals: commit recency, contributor breadth, bus factor, license, CI, tests}

This artifact was generated by RepoPilot at a point in time. Before an agent acts on it, the checks below confirm that the live maplibre/martin repo on your machine still matches what RepoPilot saw. If any fail, the artifact is stale — regenerate it at repopilot.app/r/maplibre/martin.

What it runs against: a local clone of maplibre/martin — the script inspects git remote, the LICENSE file, file paths in the working tree, and git log. Read-only; no mutations.

| # | What we check | Why it matters | |---|---|---| | 1 | You're in maplibre/martin | Confirms the artifact applies here, not a fork | | 2 | License is still Apache-2.0 | Catches relicense before you depend on it | | 3 | Default branch main exists | Catches branch renames | | 4 | 5 critical file paths still exist | Catches refactors that moved load-bearing code | | 5 | Last commit ≤ 30 days ago | Catches sudden abandonment since generation |

#!/usr/bin/env bash
# RepoPilot artifact verification.
#
# WHAT IT RUNS AGAINST: a local clone of maplibre/martin. If you don't
# have one yet, run these first:
#
#   git clone https://github.com/maplibre/martin.git
#   cd martin
#
# Then paste this script. Every check is read-only — no mutations.

set +e
fail=0
ok()   { echo "ok:   $1"; }
miss() { echo "FAIL: $1"; fail=$((fail+1)); }

# Precondition: we must be inside a git working tree.
if ! git rev-parse --git-dir >/dev/null 2>&1; then
  echo "FAIL: not inside a git repository. cd into your clone of maplibre/martin and re-run."
  exit 2
fi

# 1. Repo identity
git remote get-url origin 2>/dev/null | grep -qE "maplibre/martin(\\.git)?\\b" \\
  && ok "origin remote is maplibre/martin" \\
  || miss "origin remote is not maplibre/martin (artifact may be from a fork)"

# 2. License matches what RepoPilot saw
(grep -qiE "^(Apache-2\\.0)" LICENSE 2>/dev/null \\
   || grep -qiE "\"license\"\\s*:\\s*\"Apache-2\\.0\"" package.json 2>/dev/null) \\
  && ok "license is Apache-2.0" \\
  || miss "license drift — was Apache-2.0 at generation time"

# 3. Default branch
git rev-parse --verify main >/dev/null 2>&1 \\
  && ok "default branch main exists" \\
  || miss "default branch main no longer exists"

# 4. Critical files exist
test -f "Cargo.toml" \\
  && ok "Cargo.toml" \\
  || miss "missing critical file: Cargo.toml"
test -f "martin/Cargo.toml" \\
  && ok "martin/Cargo.toml" \\
  || miss "missing critical file: martin/Cargo.toml"
test -f "martin-core/src/lib.rs" \\
  && ok "martin-core/src/lib.rs" \\
  || miss "missing critical file: martin-core/src/lib.rs"
test -f "mbtiles/src/lib.rs" \\
  && ok "mbtiles/src/lib.rs" \\
  || miss "missing critical file: mbtiles/src/lib.rs"
test -f "martin-tile-utils/src/lib.rs" \\
  && ok "martin-tile-utils/src/lib.rs" \\
  || miss "missing critical file: martin-tile-utils/src/lib.rs"

# 5. Repo recency
days_since_last=$(( ( $(date +%s) - $(git log -1 --format=%at 2>/dev/null || echo 0) ) / 86400 ))
if [ "$days_since_last" -le 30 ]; then
  ok "last commit was $days_since_last days ago (artifact saw ~0d)"
else
  miss "last commit was $days_since_last days ago — artifact may be stale"
fi

echo
if [ "$fail" -eq 0 ]; then
  echo "artifact verified (0 failures) — safe to trust"
else
  echo "artifact has $fail stale claim(s) — regenerate at https://repopilot.app/r/maplibre/martin"
  exit 1
fi

Each check prints ok: or FAIL:. The script exits non-zero if anything failed, so it composes cleanly into agent loops (./verify.sh || regenerate-and-retry).

Martin is a Rust-based tile server that dynamically generates and serves vector tiles from PostGIS databases, MBTiles, and PMTiles files at scale. It eliminates the need for pre-computed tile caches by generating tiles on-the-fly with automatic table discovery, sprite generation, and font glyph serving—optimized for heavy traffic with minimal overhead. Monorepo with workspace members: martin/ (main server using actix-web), martin-core/ (shared tile logic), martin-tile-utils/ (tile utilities), and mbtiles/ (MBTiles tooling crate). Server exposes POST/GET endpoints for tile requests, sources auto-discovered from PostgreSQL, and composite sources combine multiple backends. Lambda integration via .github/files/lambda-function/ with custom bootstrap. Demo database in demo/db/ with PostgreSQL + test data.

GIS engineers and web mappers who need to serve large PostGIS datasets as vector tiles to MapLibre/Mapbox clients without maintaining separate tile generation pipelines; DevOps teams deploying tile infrastructure in Kubernetes or AWS Lambda; tile tool developers who need to inspect, validate, or bulk-convert MBTiles/PMTiles files.

Production-ready and actively maintained. The project shows strong maturity signals: comprehensive CI/CD workflows (build, bench, coverage, security audit), OpenSSF Best Practices badge, codecov integration, Rust 1.92+ MSRV, and active GitHub Actions across multiple platforms. Recent workflow files and detailed security/dependabot configs indicate ongoing, professional development.

Low structural risk but requires careful dependency management: the workspace pulls 80+ dependencies (actix-web, postgres drivers, image processing) and Rust edition 2024 suggests cutting-edge changes. No single-maintainer risk evident (maplibre organization), but unsafe code is explicitly allowed in the mbtiles crate—security audits are automated so monitor those. PostGIS connectivity is a critical path dependency; configuration errors in debian/config.yaml or lambda deployments could cause silent failures.

Active workflow maintenance visible: CI runs on every commit (.github/workflows/ci.yml), benchmark profiling with hotpath analysis (.github/workflows/bench.yml), automated PR labeling and title validation, multi-platform Docker builds, and Homebrew distribution. Dependabot actively managing Rust and GitHub Actions updates. The codebase is being kept current with modern Rust editions (2024) and dependency chains.

Clone and build with Cargo (Rust 1.92+ required): git clone https://github.com/maplibre/martin && cd martin && cargo build --release. Run the server with CLI: cargo run --bin martin -- --config demo/config.yaml (requires PostgreSQL running; demo provides a Docker Compose setup in demo/db/Dockerfile). For quick testing, examine Cargo.toml workspace members and run cargo test to validate your build.

Daily commands: Development: cargo run --bin martin -- --config demo/config.yaml (starts HTTP server, defaults to port 3000). With demo database: Inside demo/ directory, start PostgreSQL via the Dockerfile, then connect Martin to it. Tools: cargo run --bin martin-cp -- <source> <dest.mbtiles> (bulk tile generation), cargo run --bin mbtiles -- <command> <file.mbtiles> (inspect/validate/diff tiles). Tests: cargo test (all members) or cargo test -p martin-core (specific package).

• Cargo.toml — Workspace root configuration defining all member crates (martin, martin-core, martin-tile-utils, mbtiles) and shared dependencies; essential for understanding build structure.
• martin/Cargo.toml — Main binary crate configuration; defines the tile server's direct dependencies and entry point for the application.
• martin-core/src/lib.rs — Core library root likely containing the primary tile serving logic, PostGIS integration, and tile generation abstractions.
• mbtiles/src/lib.rs — MBTiles format handling library; critical for reading/writing tile databases and format compliance.
• martin-tile-utils/src/lib.rs — Tile utility functions shared across the workspace; contains coordinate systems, tile math, and common transformations.
• demo/docker-compose.yml — Complete development environment setup showing how PostGIS, Martin, and frontend interact; reference for understanding architecture.
• .github/workflows/ci.yml — Primary CI pipeline defining test, build, and deployment automation; reveals code quality standards and testing requirements.

• martin (HTTP Server) (Axum/Hyper (likely), Tokio async runtime) — HTTP listener, route parsing, request dispatch to tile sources, response formatting (MVT/PNG/JSON)
  • Failure mode: Port binding failure, malformed request → HTTP 400/500; tile generation timeout → HTTP 504
• martin-core (Tile Engine) — Abstraction over tile sources (PostGIS,

Add support for a new tile source format

1. Create a new module in martin-core implementing the TileSource trait (or similar abstraction) (martin-core/src/lib.rs)
2. Add connection and configuration handling for the new format in the server config parser (martin/src/main.rs or martin-core/src/config.rs)
3. Implement tile coordinate to data query mapping using martin-tile-utils for consistency (martin-tile-utils/src/lib.rs)
4. Add integration tests in martin-core and update demo config if applicable (demo/docker-compose.yml or new test file)

Add a new HTTP endpoint or tile request format

1. Define the route and request handler in the HTTP server (likely in martin/src) (martin/Cargo.toml (add router dependency if needed))
2. Implement request parsing and parameter validation (martin-core/src/lib.rs)
3. Call existing tile generation pipeline, converting output to desired format (martin-tile-utils/src/lib.rs)
4. Add tests and document in demo frontend or integration tests (demo/frontend or .github/workflows/ci.yml)

Optimize tile generation performance

1. Profile current hot paths using benchmarks in .github/workflows/hotpath-profile.yml (.github/workflows/hotpath-profile.yml)
2. Identify bottleneck in tile encoding or database query in martin-core or martin-tile-utils (martin-core/src/lib.rs or martin-tile-utils/src/lib.rs)
3. Apply optimization (caching, vectorization, algorithm improvement) and validate with benchmarks (.github/workflows/bench.yml)
4. Ensure clippy and linter rules still pass; document trade-offs in CHANGELOG.md (CHANGELOG.md)

• Rust — Memory-safe systems language enabling blazing-fast tile generation and low-latency HTTP serving without garbage collection
• PostGIS — Mature spatial database enabling on-demand vector tile generation from large geographic datasets with SQL-driven filtering
• MBTiles/PMTiles — Standardized binary formats for pre-computed tiles; MBTiles for fast cached lookup, PMTiles for cloud-optimized streaming
• MapLibre GL JS — Open-source vector tile renderer for web; demo uses it to consume Martin-generated tiles client-side
• Docker/Lambda — Containerized and serverless deployment options for scalability; supports multi-platform builds (x86, ARM)

• Synchronous HTTP tile serving vs. async job queue

  • Why: Tile requests must complete in <500ms for interactive maps; on-demand generation trades throughput for latency predictability
  • Consequence: High concurrency load may spike CPU; solved via caching (MBTiles) and query optimization, not horizontal scaling

• Support both PostGIS (dynamic) and MBTiles (static) in single binary

  • Why: PostGIS enables live data updates; MBTiles provides pre-computed performance; covering both use cases maximizes utility
  • Consequence: Code complexity and multiple tile source implementations; mitigated by trait-based abstraction

• Lightweight single-binary deployment vs. microservices

  • Why: Simplifies deployment, reduces operational overhead, suits edge/Lambda/embedded scenarios
  • Consequence: Vertical scaling limits; horizontal scaling requires multiple instances and load balancing outside Martin

• Strict Rust compiler/clippy rules (forbid unsafe, warn on unwrap) vs. developer velocity

  • Why: Security and reliability in tile serving; panics in production must be prevented
  • Consequence: Stricter code review process and more verbose error handling required

• Authentication and authorization (per README: tile server assumes trusted network or reverse-proxy auth)
• Real-time tile updates via WebSocket push (request-response HTTP model only)
• Native support for shapefile, GeoJSON file sources (PostGIS is the canonical spatial database)
• Raster tile generation (vector tiles only; rasterization delegated to clients)
• Cross-platform GUI administration tool (CLI and config files are primary interfaces)

PostGIS requirement: Martin requires a live PostgreSQL instance with PostGIS extension to discover tables at startup—missing or misconfigured PG connections fail silently in some code paths. Check demo/db/initdb for required extensions. Configuration precedence: CLI args override config files, which override env vars—easy to miss when debugging. Unsafe code in mbtiles: The crate allows unsafe code explicitly (workspace lints allow it there); security audits must run regularly. Lambda layer size: Rust binaries are large; the .github/files/lambda-layer/ assumes specific compression/packaging—deviations fail at runtime. Tile coordinate system: Vector tiles use Web Mercator (EPSG:3857); PostGIS queries must respect this or produce misaligned tiles. ETag caching: Actix-middleware-etag adds headers but requires stable tile content—dynamic tiles may cache incorrectly if not configured.

• Vector Tiles (MVT / Mapbox Vector Tile Spec) — Martin's entire purpose is generating and serving MVT format; understanding tile structure (layers, features, geometry encoding) is essential to debug tile-serving bugs and schema mismatches
• Web Mercator Projection (EPSG:3857) — Vector tiles and PMTiles/MBTiles use Web Mercator; PostGIS queries must respect this coordinate system or tiles render misaligned—critical for spatial correctness
• Tile Coordinate System (Z/X/Y) — Martin's URL routing and all tile requests use z/x/y coordinates; understanding how zoom levels map to tile grids is fundamental to caching, indexing, and URL design
• Connection Pooling (deadpool-postgres) — PostGIS tile generation is high-concurrency; the deadpool pool manages PostgreSQL connections efficiently—misconfigurations cause connection starvation under load
• Content Delivery via ETag / HTTP Caching — Martin uses actix-middleware-etag for client-side caching; understanding ETag generation and cache headers is critical for CDN integration and bandwidth optimization
• Async/Await and Tokio Runtime — Martin's actix-web uses async Rust extensively; understanding Futures, spawn_local, and blocking_on is essential for adding features without deadlocks
• Protocol Buffers (Protobuf) — Vector tiles are protobuf-encoded; martin-tile-utils decodes/encodes them—understanding protobuf structure is required to modify tile payload or debug serialization
• Composite Data Sources Pattern — Martin's composite sources layer multiple backends (PostGIS + PMTiles + MBTiles) into one endpoint; understanding merge logic prevents data loss or conflicts when combining sources

• maplibre/maplibre-gl-js — Reference client library for rendering Martin-served vector tiles; essential to understand tile format expectations and client-side integration
• protomaps/PMTiles — Cloud-optimized tile format that Martin serves; understanding PMTiles v3 spec is critical for the HTTP tile streaming feature
• mapbox/mbtiles-spec — MBTiles specification reference; Martin's mbtiles crate implements this format for tile storage and inspection
• pramsey/pg_tile_quadtree — PostGIS tile generation inspiration; predecessor approach to dynamic tile serving from PostgreSQL (Martin is the modern, production alternative)
• maplibre/demotiles — Sample PMTiles datasets used for testing and demos; critical for understanding test data generation pipelines

To work on one of these in Claude Code or Cursor, paste: Implement the "<title>" PR idea from CLAUDE.md, working through the checklist as the task list.

Add integration tests for Lambda deployment configuration and function

The repo includes Lambda infrastructure files (.github/files/lambda-function/, .github/files/lambda-layer/, .github/files/lambda.yaml) but there's no visible CI workflow or integration tests validating that the Lambda function correctly handles tile requests. This is critical for users deploying Martin on AWS Lambda, as configuration errors could silently fail in production.

• [ ] Create .github/workflows/lambda-integration-tests.yml to build and test the Lambda function with sample PostGIS/MBtiles sources
• [ ] Add integration tests in a new tests/lambda/ directory that validate the Lambda bootstrap and handler with mock events
• [ ] Document the Lambda deployment flow in a new LAMBDA_DEPLOYMENT.md guide with tested examples

Add clippy lint enforcement to CI/CD for all workspace members

The Cargo.toml defines strict clippy lints (panic, unwrap_used, todo, unimplemented) with workspace-level configuration, but the .github/workflows/ci.yml doesn't explicitly show clippy enforcement for all members (martin, martin-core, martin-tile-utils, mbtiles). This risks merging code that violates the linting policy.

• [ ] Update .github/workflows/ci.yml to add explicit cargo clippy --all-targets --all-features -- -D warnings for each workspace member
• [ ] Add a separate step to verify clippy.toml is being respected across the workspace
• [ ] Document lint expectations in CONTRIBUTING.md with examples of code patterns to avoid

Add E2E tests for demo docker-compose setup with frontend tile requests

The demo/ directory contains a complete docker-compose environment with PostGIS, Martin, and a frontend, but there's no visible test workflow that validates the full stack works end-to-end. This is valuable for catching regressions in tile serving, CORS configuration, and frontend integration.

• [ ] Create .github/workflows/demo-e2e-tests.yml that spins up demo/docker-compose.yml and validates tile endpoint responses
• [ ] Add tests in tests/e2e/ that check: tile request success (z/x/y.pbf), HTTP headers (CORS, ETag), and frontend JavaScript can fetch tiles
• [ ] Update demo/README.md with instructions for running E2E tests locally with docker-compose

• Add integration tests for composite tile sources: File martin/src/sources/ has composite source code but _tests directory has minimal coverage for multi-source scenarios—write tests combining PostGIS + PMTiles sources to verify merging logic
• Document PostGIS function discovery in martin-core: The auto-discovery mechanism in martin-core/src/ is powerful but undocumented in code—add rustdoc examples showing how tables and SQL functions are detected and converted to tile endpoints
• Add CLI examples for martin-cp bulk tile export with filtering: The martin-cp binary exists in Cargo.toml but has minimal example invocations in README—add concrete shell command examples showing zoom-level filtering, bounding-box clipping, and format conversion (MBTiles → PMTiles)

• Medium · Unsafe Code Usage in mbtiles Crate — Cargo.toml (workspace.lints.rust comment). The workspace configuration explicitly notes that the 'mbtiles' crate uses unsafe code and therefore cannot enforce the 'unsafe_code = "forbid"' lint at the workspace level. This indicates potential memory safety issues that require careful review. Fix: Conduct a thorough security audit of the mbtiles crate's unsafe code blocks. Document the safety invariants, add comprehensive comments, and consider using safe alternatives where possible. Implement additional testing for unsafe code paths.
• Medium · Panic Allowed in Result-Returning Functions — Cargo.toml (workspace.lints.clippy). The clippy lint configuration includes 'panic_in_result_fn = "warn"' which suggests panics in result-returning functions are only warned about, not forbidden. This could lead to unexpected application crashes instead of proper error handling. Fix: Change 'panic_in_result_fn' from 'warn' to 'deny' to enforce proper error handling throughout the codebase. Replace all panics in result-returning functions with proper error propagation.
• Medium · Unwrap Usage Permitted in Codebase — Cargo.toml (workspace.lints.clippy). The configuration allows 'unwrap_used = "warn"' which means unwrap calls are only warned about rather than forbidden. Unwraps can cause panics in production code if not carefully managed. Fix: Elevate 'unwrap_used' from 'warn' to 'deny'. Replace all unwrap calls with proper error handling using Result types and the '?' operator.
• Medium · TODO and Unimplemented Markers in Production Code — Cargo.toml (workspace.lints.clippy). The lints allow 'todo' and 'unimplemented' with only 'warn' severity. These should not appear in production code as they indicate incomplete implementations that could lead to runtime panics. Fix: Change both 'todo' and 'unimplemented' from 'warn' to 'deny'. Complete all incomplete code paths before merging to production.
• Low · Demo Credentials in Docker Configuration — demo/docker-compose.yml and docker-compose.yml. The docker-compose.yml file contains hardcoded PostgreSQL credentials (PGUSER=postgres, PGPASSWORD=postgres) in plain text. While this is acceptable for development, the credentials could be exposed if the configuration is accidentally committed to version control. Fix: Use environment variable substitution with .env files (added to .gitignore) for all credentials. Document that these are development-only credentials. For production deployments, use secrets management systems.
• Low · Exposed Database Port in Development — docker-compose.yml (db service). The PostgreSQL service exposes port 5411 (or configurable PGPORT) directly without authentication restrictions in the development docker-compose.yml, making it accessible from outside the container network. Fix: In production, do not expose database ports. Use Docker networking to restrict access to application containers only. Document that this is development-only configuration.
• Low · Missing Security Headers Configuration in Frontend — demo/frontend/nginx.conf. The demo frontend includes an nginx configuration file but no visible security headers (CSP, HSTS, X-Frame-Options, etc.) in the provided file structure. Fix: Add security headers to the nginx configuration including Content-Security-Policy, Strict-Transport-Security, X-Content-Type-Options: nosniff, X-Frame-Options: DENY, and X-XSS-Protection headers.
• Low · Dependent on External Docker Images — docker-compose.yml and demo/db/Dockerfile. The project uses external Docker images (nginx:alpine, postgis/postgis:18-3.6-alpine) without explicit version pinning in some places, which could introduce supply chain risks. Fix: Pin all external Docker images to specific SHAs or explicit versions. Regularly scan base images for vulnerabilities. Consider using private registry mirrors for critical dependencies.
• Info · Positive Security Practice: Clippy Lints Enabled — undefined. undefined Fix: undefined

LLM-derived; treat as a starting point, not a security audit.

• Open issues — current backlog
• Recent PRs — what's actively shipping
• Source on GitHub

Generated by RepoPilot. Verdict based on maintenance signals — see the live page for receipts. Re-run on a new commit to refresh.