drscrewdriver/dsh-date-wrapper

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• Guide d'installation
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▼ DSH version compatibility

DSH version	Load	Host contract	Client half
0.1.0-rc.7 ~ 0.1.7.x (0.1.x line)	✅ artifact ≤ 0.2.0	systemPrompt.context({ name, order, text })	— (host-only plugin)
0.2.0-rc.1+ (>=0.2.0-rc.1 <0.2.1-0)	✅ artifact ≥ 0.3.0	same signature; packages/core/system-prompt diff vs dsh-v0.1.7-rc.2 is the version string only	— (host-only plugin)

One contract covers all lines: the plugin only calls systemPrompt.context, whose signature and semantics are unchanged from dsh-v0.1.1-rc.2 through dsh-v0.2.0-rc.1. It registers no settings namespace, reads no session data and makes no RPC call, so the 0.1.1 → 0.1.2 client/session/persistence rewrites and the 0.1.7 → 0.2.0-rc.1 host changes do not touch it. Older 0.1.x hosts stay on artifact ≤ 0.2.0 (dist-tag dsh-0.1.7); the 0.2.0 line is served by artifact ≥ 0.3.0.

A minimal date line: it hangs Current date: 2026-09-08 Asia/Shanghai Tuesday (46 characters, ~12 tokens) onto the runtime-context snapshot DSH already sends. It does not load @deepseek-ai/dsh-time-context, does not add extra session messages, does not patch DSH source, and needs no PR.

• How it works: DSH sessions, JSONL and request assembly (Chinese)
• HANDOVER.md (Chinese)

What this plugin solves

DSH's own @deepseek-ai/dsh-time-context injects about 280 characters of metadata on every request:

Time sampled while preparing turn 3, step 2: 2026-09-08T16:05:36+08:00[Asia/Shanghai]
Browser time zone for this request: Asia/Shanghai. Interpret otherwise-unqualified dates and times in this zone.
Elapsed since the preceding model-visible message: 2m 34s.

This plugin compresses the same information into a single 46-character line and moves where it lands — it no longer goes into the message stream:

Current date: 2026-09-08 Asia/Shanghai Tuesday

Dimension	dsh-time-context	dsh-date-wrapper
Injected text	~280 characters	46 characters (↓84%), ~12 tokens
Landing point	One message per pre-step (user/message)	The platform runtime-context snapshot (systemPrompt.context)
Frequency	One event per eligible step	Re-sent with the snapshot only when the text changes (0 events within a day)
Dependency	agents service	systemPrompt service
Runtime dependencies	—	none

Version compatibility

Item	Verdict
Target DSH versions	0.1.0-rc.7 → 0.1.7.x (0.1.x line — artifact ≤ 0.2.0) and 0.2.0-rc.1 → 0.2.0.x (0.2.0 line, engines.dsh: >=0.2.0-rc.1 <0.2.1-0 — artifact ≥ 0.3.0)
settings API	Not applicable: the plugin registers no settings and exports no schemastery Config
Contract points used	Exactly one — systemPrompt.context()
Conflict with a native feature	Overlaps @deepseek-ai/dsh-time-context; do not use both. Not installed by default = off by default
Browser half	None: no slot, no DOM, no CSS semantic tokens
DSH package imports	Zero: nothing from @deepseek-ai/*, which is stricter than the "runtime detection + dual API fallback" pattern

Contract point	0.1.0-rc.7	0.1.1-rc.2	0.1.2-rc.1	0.1.3-alpha.2	0.1.7-rc.2	0.2.0-rc.1
systemPrompt.context(ctx): () => void	yes	yes (verified on this host)	yes	yes	yes	yes (diff vs 0.1.7-rc.2: version string only)
PromptContext = { name, order, text }, no complete field	yes	yes	yes	yes	yes	yes
includeRuntimeContext / suppressRuntimeContext	yes	yes	yes	yes	yes	yes
agent-loop project() text dedupe and surfaceOp: "append"	yes	yes	yes	not compared	yes	yes
order: 116 collision-free (110 / 115 / 120 taken)	yes	yes	yes	yes	yes	yes

Method: npm pack @deepseek-ai/dsh-system-prompt@<version>, unpack, and compare lib/types/index.d.ts and lib/index.js; the same for @deepseek-ai/dsh-agent-loop. Between dsh-v0.1.7-rc.2 and dsh-v0.2.0-rc.1 the packages/core/system-prompt diff is a single version line, the 110/115/120 systemPrompt.context call sites are unchanged, and the plugin migration guide has no systemPrompt entry. Only 0.1.1-rc.2 has been verified at runtime on this host; runtime smoke on 0.2.0-rc.1 is tracked in HANDOVER.md §7.

Why a runtime-context snapshot instead of a message

The first attempt copied dsh-time-context and appended a user/message in agent/pre-step. Measured cost was too high: each JSONL event is 339 bytes (the text is only 46 of them, because content and sections each store a copy) and it wrote one every turn.

Registering a runtime context instead folds the date into the snapshot message the platform already sends:

• The platform deduplicates snapshots by text (RuntimeContextProjection.project() in dsh-agent-loop: if (this.retained?.text === snapshot) return), so while the date is unchanged not a single extra event is written;
• Snapshots append a new message (surfaceOp: 'append') rather than rewriting in place, so the request sequence only grows → the prefix cache is preserved;
• Our marginal cost is those 46 bytes, and only when the snapshot is re-sent because its text changed.

Measured on this host (one real session, 10 turns / 231 steps):

Item	Measured
Platform runtime-context snapshots	2 events, 1133 B each, 2.3 KB total
Real user messages	10 events, 396 B each
Old approach (one message per turn)	10 × 339 B ≈ 3.4 KB
This approach	0 extra events; ~46 B folded into an existing snapshot

Configuration

Shipped with cordis.patch.yml; restart after changing it:

- insert:
    - id: date-wrapper
      name: dsh-date-wrapper
      config:
        timeZone: Asia/Shanghai   # IANA zone; omit to use the process zone

• An invalid timeZone throws at startup (no silent fallback to UTC).
• The zone name in the text is the resolved IANA name (the process zone name when timeZone is omitted).
• The runtime-context entry is named date-wrapper:date with order 116 (already taken: 110 sandbox, 115 approval, 120 subagent).
• The plugin exports no schemastery Config, so its config skips the host schema validation; everything is validated by hand in validateConfig(). That is also why the Settings → Plugins page has no config form for it.

On/off: the plugin's activation is the switch, there is no panel toggle

The plugin ships no settings-panel toggle and no enabled config field, because:

• The feature switch is whether the plugin row is active. Inactive → apply() never runs → the runtime-context entry does not exist → not a single character is injected.
• There is no browser half (dsh.client), so the UI owns no widget of ours.
• DSH's built-in Settings → Plugins page already shows each entry as enabled / disabled (read-only).

How to turn it off

Override it by id in your own profile patch layer — C:\Users\<you>\.dsh\profiles\web\cordis.patch.yml:

- id: date-wrapper
  disabled: true    # disabled; set back to false to restore

• Hot, no restart: that file is watched by Cordis HMR, and disabled: true disposes the row's fiber directly.
• If the date-wrapper row does not exist yet (not installed), this patch only logs an entry "date-wrapper" not found warning; startup still succeeds.
• ⚠️ The file must be a top-level YAML array; if it is malformed, startup fails (DSH is fail-loud for user patch layers).

How to remove it completely

dsh plugin --profile web remove dsh-date-wrapper

Removal goes through the bundle layer and requires a restart of dsh web (bundle patches are not hot-reloaded).

Install

dsh plugin --profile web add github:drscrewdriver/dsh-date-wrapper

Restart dsh web and refresh the page. Local paths, link mode and troubleshooting: INSTALL.md.

Verification

#	How	Expected
A1	Open a new session and send one message	The runtime-context snapshot contains Current date: YYYY-MM-DD <zone> <weekday> (shown as an injected context row sourced from system-prompt)
A2	Check that line	≤50 characters (46 measured; the PRD threshold of 30 was relaxed for the requested format)
A3	Disable the plugin (profile patch disabled: true)	The line no longer appears in later sessions' snapshots
A4	Search the session log	No Time sampled / Elapsed since / Browser time zone
A5	Set timeZone to UTC and restart	The date follows UTC (may differ by one day across zone boundaries)

Implementation notes

dsh-date-wrapper/
├── package.json          # name / type: module / main / exports["."] / dsh.bundle.patch / files
├── cordis.patch.yml      # one insert row (no patch-level id → lands at the profile root = host plane)
├── src/
│   ├── format.js         # pure functions: resolveZone / renderDate / createDateContextText / validateConfig / TEXT_LABEL
│   └── index.js          # apply(ctx, config) → ctx.inject(['systemPrompt'], …) → systemPrompt.context(...)
└── tests/
    ├── format.test.mjs   # 11 cases (zone projection, weekday, format and length, degradation, config validation)
    └── context.test.mjs  # 7 cases (registration contract against a fake ctx)

• Host-plane row: ctx.inject(['systemPrompt'], …) opens a child fiber; if the service is missing, the plugin silently registers nothing instead of failing the whole boot.
• Fail-soft text provider: throwing during prompt assembly would fail every request, so a render failure returns an empty string (the platform filters empty text out).
• No complete: setting it would shadow the entire system prompt.
• Deduplication is the platform's job: no per-agent state is kept; across midnight the snapshot simply carries the new date.
• Lifecycle: the registration belongs to the ctx.inject child fiber and is reclaimed when the plugin is deactivated.

Development: TDD + lint

npm install          # devDependencies only (eslint / @eslint/js); zero runtime dependencies

npm run tdd          # watch mode: rerun on src/ or tests/ changes (node --test --watch)
npm test             # one full run: node --test "tests/*.test.mjs"
node tests/format.test.mjs   # run a single file (most reliable under a sandbox: no child process)

npm run lint         # eslint . (src + tests + eslint.config.mjs)
npm run lint:fix     # auto-fix what can be fixed
npm run verify       # lint + test; run this before committing

Red-green-refactor

Test cases map directly to acceptance criteria: write a failing assertion first, then make it pass.

Step	Action	Command
1 red	Add an assertion in tests/*.test.mjs named after the acceptance criterion, asserting the behaviour you do not have yet	npm run tdd
2 green	Write the minimal implementation in src/ to pass it without touching other assertions	npm run tdd
3 refactor	Rename and extract pure functions while staying green; src/format.js holds all pure logic, src/index.js only registers	npm run tdd
4 gate	Run lint + the full suite before committing	npm run verify

18 assertions today: format.test.mjs (11) covers the pure functions, context.test.mjs (7) asserts the registration contract against a fake ctx.

Lint configuration highlights

• ESLint 10 flat config (eslint.config.mjs) with @eslint/js recommended as the baseline.
• Tightened rules: eqeqeq, prefer-const, object-shorthand, no-unused-vars (_ prefix exempt).
• Node globals crypto / console / process are declared explicitly, otherwise no-undef false-positives.

Known limitations

• Inactive under fixed-prompt presets: if a preset's persona sets includeRuntimeContext: false (the official minimal and the local simple-reply both do), assemble() returns contexts: [] and this plugin's entry is dropped wholesale. Those presets are designed to forbid later listeners from adding anything to the prompt.
• Old snapshots stay in history: when the date changes the platform appends a new snapshot (the old one is kept) and the new one takes effect through its own "This snapshot supersedes earlier runtime-context snapshots" declaration — the same way the platform handles cwd / sandbox / approval policy changes.
• Bundle patches are not hot-reloaded: changing cordis.patch.yml or upgrading the plugin requires a dsh web restart (changing disabled in the profile patch is hot).
• dsh-time-context is neither loaded nor filtered: if you mount it explicitly in a preset, its verbose text appears as usual. Do not use both.
• No runtime probe for the contract point: systemPrompt.context is called unguarded, so a future DSH rename would surface as a plugin load failure instead of a silent degradation (see HANDOVER.md §7).

License

MIT