[!NOTE] 📦 This plugin lives in the dsh-plugins monorepo — file issues & pull requests there. npm: @hy-sde-org/dsh-session-url

dsh-session-url — session:// scheme for DeepSeek Harness

A standalone public package: @hy-sde-org/dsh-session-url — the session:// internal-URL scheme handler that exposes the harness's own session history as file-shaped resources for internal-URL-aware read and grep tools: directory listings, rendered transcripts, exact per-event JSON, and FTS-backed cross-session search.

Published standalone so any official DeepSeek Harness installation can mount the scheme without adopting the fork that originally hosted @deepseek-ai/dsh-session-url. The only fork-only dependency of the original (@deepseek-ai/dsh-internal-urls, unpublished in the stock harness) is vendored (types + parse + router, see src/vendor/internal-urls/) with a keep-in-sync marker, so this package compiles and tests with no unpublished dependency — its runtime deps (@deepseek-ai/dsh-session-query, @deepseek-ai/dsh-session) are all published.

Why

Your own session history becomes files: past sessions — transcripts, exact per-event JSON, listings, FTS search — are read and grepped through the ordinary internal-URL-aware read/grep tools, so the model navigates its own history with the file tools it already has instead of a bespoke interface.

Prerequisites

• Node.js 22.19 or newer with npm and pnpm on PATH;
• DeepSeek Harness 0.1.1-rc.2 or later (per the shipped cordis.patch.yml: the insert never breaks boot on a stock release from that floor on), including the standard dsh CLI;
• the session-url row stays dormant until the process also mounts both ctx.internalUrls (the internal-URL registry, e.g. the standalone @hy-sde-org/dsh-internal-urls) and a session-query engine (ctx.sessionQuery, published @deepseek-ai/dsh-session-query) — installing this package alone is harmless;
• peers @deepseek-ai/cordis ~4.0.4, @deepseek-ai/dsh-session ^0.2.0-rc.2, @deepseek-ai/dsh-session-query ^0.2.0-rc.2 — npm resolves them on install.

Quick start

Route A — published npm package (recommended)

dsh plugin --profile web add @hy-sde-org/dsh-session-url

The shipped cordis.patch.yml inserts the host-plane session-url row on install; it touches no existing row.

Route B — from source (validate this checkout or hack on the handler)

git clone git@github.com:hy-sde/dsh-plugins.git
cd dsh-plugins
pnpm install
pnpm --filter @hy-sde-org/dsh-session-url build

SESSIONURL_TGZ="$(cd dsh-session-url/packages/session-url && pnpm pack --pack-destination /tmp | tail -n 1)"
dsh plugin --profile web add "$SESSIONURL_TGZ"

pnpm pack runs the normal prepack build and produces a tarball containing dist/.

Verify the composed configuration

dsh web --dump-config        # the session-url row is present in the base bundle

Then smoke-test the scheme through an internal-URL-aware read tool, per the Use examples: list session://* (known sessions, newest first), then read session://<id> for one rendered transcript. Until the registry and a session-query engine are also mounted, the row reports it is "waiting for" them instead of serving resources.

Run

dsh web

Ask the model to navigate its own history as files — the file-shaped examples are in Use.

Uninstall

dsh plugin --profile web remove @hy-sde-org/dsh-session-url

The inserted session-url row goes with the package; the internal-URL registry and the session-query engine are separate installs and stay.

Use

Mount it as a host-plane plugin row next to the internal-URL registry it extends (ctx.internalUrls, provided by the standalone @hy-sde-org/dsh-internal-urls) and require a session-query engine (ctx.sessionQuery, published @deepseek-ai/dsh-session-query) — the shipped cordis.patch.yml inserts exactly this row on dsh plugin add; author it by hand only when composing manually:

- id: session-url
  name: '@hy-sde-org/dsh-session-url'

Then the internal-URL-aware read / grep tools navigate history as files:

read session://0a1b2c3d4e          # rendered transcript
read session://0a1b2c3d4e/event/42 # one exact event as JSON
list session://*                    # known sessions, newest first
grep tsconfig session://0a1b2c3d4e  # grep the transcript
read "session://search?q=tsconfig"  # FTS hits (degrades when search is disabled)

Read-only by design: every resource is immutable, sizes are capped (600-event transcripts / 12 000 for grep / 200-session listings / 128 KiB event JSON), and the handler performs no filesystem access.

Development

pnpm install
pnpm -r check       # strict typecheck (src + tests)
pnpm -r test        # handler + router-integration tests
pnpm -r build       # tsc -> dist
bash scripts/release-public.sh --check      # pre-publish validation
bash scripts/release-public.sh --publish    # publish to npm

Layout

packages/session-url/   @hy-sde-org/dsh-session-url — the session:// scheme
  src/index.ts                       plugin apply: register into ctx.internalUrls
  src/handler.ts                     SessionProtocolHandler (resolve/complete)
  src/vendor/internal-urls/          vendored fork-only internal-urls surface
  tests/handler.spec.ts              13 handler + router-integration tests

License and attribution

This repo is licensed MIT — see LICENSE (© 2026 hy-sde). The session:// scheme handler (transcript / event-JSON / listing / search surface and its Cordis apply) is derived from the DeepSeek Harness codebase (MIT, © 2026 DeepSeek), ported from packages/session-query/session-url; the vendored src/vendor/internal-urls/ surface is likewise DeepSeek Harness code (the fork-only @deepseek-ai/dsh-internal-urls), kept verbatim. The full provenance is aggregated in THIRD-PARTY-NOTICES.md. This is a separately installable package; the harness remains the property of its own project.