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Version: 0.2.15

Agent workflow (building software with autonomous coding agents)

X07 is designed around a simple reality:

An agent that writes code also needs to run checks, read diagnostics, apply patches, and prove invariants—without human intervention.

So the workflow is built into the ecosystem:

  • strict output contracts (JSON everywhere),
  • deterministic tools,
  • stable error codes,
  • canonical file layouts.

New here? Start with Agent quickstart — it is the canonical on-ramp and defines the core agent loop. This page covers the project-shaping pieces an agent needs on top of that loop: the architecture contract file, the package → example → scenario map, and the boundary rules.

The “architecture contract” file​

Every serious X07 project should include:

  • AGENT.md

This is a short, structured contract that tells the agent:

  • what the system is,
  • what constraints it must respect,
  • what must never change,
  • how to run tests and interpret failures.

Use the template in: Agentic design patterns.

The agent loop​

The core agent loop (run → test → repair, with patches and migration) is defined once in Agent quickstart. Run it from the project root; this page assumes that loop is already in place.

Two project-level habits make the loop reliable for autonomous work:

  • Read the task/spec + AGENT.md first, and use x07 doc <symbol> for behavioral summaries of stdlib exports before guessing at APIs.
  • When OS access is required, prefer explicit profiles (for example x07 run --profile os / x07 run --profile sandbox) and run x07 doctor early to catch platform prerequisites.

If you want a good mental model for “AI-native engineering”, see OpenAI’s Codex guide on building AI-native engineering teams.

Canonical by-example workflow (CI-gated, offline)​

The x07 repo includes two canonical, CI-gated “agentic” by-example surfaces:

  • Agent-gate example projects under docs/examples/agent-gate/ (runnable via x07 run, validated by ./scripts/ci/check_agent_examples.sh)
  • Agent-scenario fixtures under ci/fixtures/agent-scenarios/ (validated by ./scripts/ci/check_agent_scenarios.sh)

Package → example → scenario map​

Each capability below has one canonical package, one runnable example, and one or more scenario fixtures.

  • text.core (canonical: ext-text)
    • Example: docs/examples/agent-gate/text-core/text-utils/ (x07 run)
    • Scenarios:
      • ci/fixtures/agent-scenarios/text-core/missing-dep/
      • ci/fixtures/agent-scenarios/text-core/semantics/
  • math.bigint (canonical: ext-bigint-rs)
    • Example: docs/examples/agent-gate/math-bigint/factorial-100/ (x07 run)
    • Scenarios:
      • ci/fixtures/agent-scenarios/math-bigint/missing-dep/
      • ci/fixtures/agent-scenarios/math-bigint/codec-v1/
  • math.decimal (canonical: ext-decimal-rs)
    • Example: docs/examples/agent-gate/math-decimal/money-format/ (x07 run)
    • Scenarios:
      • ci/fixtures/agent-scenarios/math-decimal/missing-dep/
      • ci/fixtures/agent-scenarios/math-decimal/scale-rounding/
  • text.unicode (canonical: ext-unicode-rs)
    • Example: docs/examples/agent-gate/text-unicode/normalize-casefold/ (x07 run)
    • Scenarios:
      • ci/fixtures/agent-scenarios/text-unicode/missing-dep/
      • ci/fixtures/agent-scenarios/text-unicode/normalize-casefold-segmentation/
  • data.cbor (canonical: ext-cbor-rs)
    • Example: docs/examples/agent-gate/data-cbor/roundtrip/ (x07 run)
    • Scenarios:
      • ci/fixtures/agent-scenarios/data-cbor/missing-dep/
      • ci/fixtures/agent-scenarios/data-cbor/canonical-encoding/
  • data.msgpack (canonical: ext-msgpack-rs)
    • Example: docs/examples/agent-gate/data-msgpack/roundtrip/ (x07 run)
    • Scenarios:
      • ci/fixtures/agent-scenarios/data-msgpack/missing-dep/
      • ci/fixtures/agent-scenarios/data-msgpack/encoding-vectors/
  • checksum.fast (canonical: ext-checksum-rs)
    • Example: docs/examples/agent-gate/checksum-fast/smoke/ (x07 run)
    • Scenarios:
      • ci/fixtures/agent-scenarios/checksum-fast/missing-dep/
      • ci/fixtures/agent-scenarios/checksum-fast/vectors/
  • diff.patch (canonical: ext-diff-rs)
    • Example: docs/examples/agent-gate/diff-patch/apply/ (x07 run)
    • Scenarios:
      • ci/fixtures/agent-scenarios/diff-patch/missing-dep/
      • ci/fixtures/agent-scenarios/diff-patch/patch-v1/
  • compress.zstd (canonical: ext-compress-rs)
    • Example: docs/examples/agent-gate/compress-zstd/roundtrip/ (x07 run)
    • Scenarios:
      • ci/fixtures/agent-scenarios/compress-zstd/missing-dep/
      • ci/fixtures/agent-scenarios/compress-zstd/roundtrip-vectors/
  • fs.globwalk (canonical: ext-path-glob-rs)
    • Example: docs/examples/agent-gate/fs-globwalk/list-files/ (x07 run)
    • Scenarios:
      • ci/fixtures/agent-scenarios/fs-globwalk/missing-dep/
      • ci/fixtures/agent-scenarios/fs-globwalk/deterministic-ordering/

Golden rule: keep boundaries explicit​

Agent-written code is far more reliable if your system architecture makes boundaries explicit:

  • pure logic separated from I/O,
  • deterministic tests separated from OS worlds,
  • adapters kept thin and declarative.

High-level primitives that make this “explicit boundaries” rule concrete:

The “ports and adapters” (hexagonal) model is a good default because it keeps I/O at the edges and preserves a stable functional core. See Alistair Cockburn’s write-up for background.