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Sightline

Same repo. Different agents. Different rules.

See which workspace instruction sources DeepSeek Harness actually loaded — and which Codex and Claude Code would load — for the same repository and working directory.

Status: v0.1.0. The first public release is available on npm and GitHub Releases. Core comparison, DSH runtime observation, Codex/Claude prediction, installable DSH bundle packaging, clean-profile validation, and the dedicated DSH Web ToolView are implemented and tested.

Why Sightline

A repository can contain AGENTS.md, CLAUDE.md, nested instructions, user-global instructions, and Claude rules at the same time. DeepSeek Harness, Codex, and Claude Code do not discover those sources identically.

That means one workspace can silently present different instruction surfaces to different coding agents.

Sightline turns that hidden difference into one compact comparison.

What you see

Same repo. Different agents. Different rules.

                    DSH        Codex       Claude
                  Observed    Predicted    Predicted
AGENTS.md             ●           ●
CLAUDE.md              ●                       ●
packages/api/AGENTS.md ●           ●
.claude/rules/always.md                         ●

The Web ToolView renders the same canonical report with explicit evidence badges and Present / Absent / Unknown states.

Agent	v0.1 evidence
DeepSeek Harness	Observed from the live DSH Session's durable typed instruction provenance when available
Codex	Predicted from documented discovery rules and local files
Claude Code	Predicted from documented memory/rules semantics and local files

Sightline never presents a prediction as observed runtime fact.

Install

The primary public v0.1 installation path is the prebuilt npm package:

dsh plugin --profile web add dsh-sightline@0.1.0

The package is published on npm as dsh-sightline@0.1.0. For development from this repository, see docs/PACKAGING.md.

Use

Start the DSH Web profile after installation:

dsh web

In a DSH session rooted in a Git repository, ask the agent to use the sightline tool, for example:

Use sightline and tell me where the DSH, Codex, and Claude instruction views diverge.

Sightline resolves all three views against the same live Session cwd and repository root.

What v0.1 does

1. Discover relevant instruction sources.
2. Resolve one effective surface per supported agent.
3. Compare the surfaces with deterministic structural rules.
4. Visualize agreement, divergence, and unknown states in DSH.

The first release intentionally does not lint instruction quality, rewrite files, synchronize agents, infer semantic contradictions with an LLM, optimize token use, or claim that a model followed an instruction.

Architecture

live DSH tool call + workspace
            |
            +---- exec.agent.session ----> DSH adapter ------ Observed ----+
            |                                                              |
            +---- ctx.fs ---------------> Codex adapter ---- Predicted ----+--> canonical report
            |                                                              |
            +---- ctx.fs ---------------> Claude adapter --- Predicted ----+
                                                                           |
                                                                           +--> model-facing projection
                                                                           +--> DSH Web ToolView

Agent-specific discovery semantics stay behind adapters. The comparison layer is pure and agent-agnostic. Hosted filesystem discovery uses the public DSH ctx.fs capability; standalone resolver use defaults to a minimal read-only Node filesystem adapter.

Privacy and trust boundary

Sightline is local-first and read-only, but "local-first" does not mean that every DSH tool result stays on the machine.

• Sightline itself makes no additional network request to a Sightline-owned service.
• Sightline does not modify instruction files.
• The full canonical report is retained as DSH tool metadata for the Web ToolView and replay; it includes workspace identity such as repositoryRoot / cwd, and the ToolView may display the absolute session cwd and full diagnostic messages. Anyone who can view that DSH Web session can see those details, subject to DSH Web access controls.
• The model-facing projection is narrower: it contains source identities, evidence labels, presence states, and diagnostic codes while omitting absolute workspace paths and full diagnostic messages by default.
• That model-facing projection is handled by the model/provider configured for the current DSH session like other DSH tool output.
• Sightline does not send instruction file bodies to a Sightline-owned service.

See docs/PRODUCT_CONTRACT.md and SECURITY.md for the complete boundary.

Compatibility

v0.1 is verified against:

• DeepSeek Harness 0.1.1-rc.2;
• upstream DSH commit b150a551b8d465e31e418e1b2eaf5e79bbb7d28e;
• Node ^22.19.0 || >=24.0.0;
• pnpm 11.7.0.

DSH is a developer preview. Sightline therefore makes a tested-version claim rather than promising broad compatibility with unverified DSH releases.

Codex and Claude Code adapters similarly carry explicit compatibility identities. Claude path-scoped rules are detected but conservatively deferred when cwd alone is insufficient to prove that the rule is active.

See docs/COMPATIBILITY.md.

Verification

Current automated coverage includes:

• package/bundle/client surface tests;
• Codex global, project, nested, override, fallback, and budget behavior;
• Claude user/project memory and always-loaded rule behavior;
• fail-closed handling of path-scoped Claude rules;
• DSH durable provenance folding and incompatible-source handling;
• real DSH ToolRuntime + SessionStore + dsh-fs-local host integration;
• canonical three-column report generation;
• clean-profile packed-artifact installation and export resolution;
• browser ToolView registration/render smoke tests;
• Windows/POSIX path normalization.

Run the local gate with:

pnpm run check

Documentation

Document	Purpose
docs/PRODUCT_CONTRACT.md	v0.1 product, evidence, privacy, and non-goal contract
docs/ARCHITECTURE.md	system boundaries and data model
docs/DSH_RUNTIME_SEAM.md	authoritative DSH provenance seam
docs/DSH_HOST_TOOL.md	live-session ownership and filesystem binding
docs/COMPATIBILITY.md	resolver/runtime compatibility identities
docs/PACKAGING.md	npm/bundle packaging and clean-profile validation
docs/RELEASE_CHECKLIST.md	public v0.1 release gates

Contributing

Issues and focused pull requests are welcome. Read CONTRIBUTING.md and AGENTS.md before making non-trivial changes.

Security-sensitive reports should follow SECURITY.md.

License

MIT. See LICENSE.

Project relationship

Sightline is an independent community project for the DeepSeek Harness ecosystem. It is not an official DeepSeek product and is not endorsed by DeepSeek unless explicitly stated by DeepSeek.