feat(config)!: one ordering for configuration sources, and a bootstrap deny rule

$DSH_HOME/.env had just become an ordinary environment layer, which left the
harness resolving user-facing values from a flattened process.env that could
no longer say where a value came from. A key stored through the web page
stayed shadowed by an older key in the user's own .env. An endpoint could be
redirected by the project: the invoking directory's .env is materialized like
every other layer, and a base URL decides where a resolved API key is sent, so
a DEEPSEEK_BASE_URL written into a model-editable workspace would send the
user's credential — and the prompts carrying their code — to whatever host
that file named.

Give every user-facing value one ordering, with four kinds of source:

  explicit for this run     per-operation override, CLI argument
  > authored by deployment  --config / --config-replace
  > this launch's shell     inherited process environment
  > product-managed store   settings.yaml, .credentials.yaml
  > discovered file         $DSH_HOME/.env
  > defaults                schema default, shipped base, public default

The domains differ only in which tiers exist. The earlier split — credentials
ranking the environment over the managed file while settings ranked over the
environment — was inconsistent: the distinguishing fact is who authored the
source, not the domain.

packages/util/environment owns an immutable snapshot with per-layer
provenance. getFrom(name, sources) searches only the layers a caller names,
and omitting one is a refusal rather than a demotion: the adapters ask for
['process', 'user-env'], so no reordering can let a project file back into a
decision it was excluded from.

isBootstrapOnly rejects, before anything is materialized, any .env setting a
variable that governs how a process launches (PATH, SHELL, NODE_OPTIONS,
LD_PRELOAD), where code or model-visible instructions load from (the whole
DSH_* namespace, HOME, XDG_*), or how the network is reached (proxy and CA
variables). The namespace is denied wholesale so a switch added later cannot
become settable by being forgotten, and there is no opt-out.

verify-config-source-ownership keeps both rules: no unregistered process.env
read under packages/*/*/src (26 allowlisted with reasons), and no apiKey,
baseURL, or headers inlined from the environment in shipped Cordis config —
removing those inlines is what makes the deployment tier meaningful.

packages/llm/llm-deepseek/package.json

@@ -28,6 +28,7 @@
   "license": "BSD-3-Clause",
   "peerDependencies": {
     "@deepseek-ai/dsh-credentials": "^0.0.1",
+    "@deepseek-ai/dsh-environment": "^0.0.1",
     "@deepseek-ai/dsh-invariants": "^0.0.1",
     "@deepseek-ai/dsh-llm": "^0.0.1",
     "@deepseek-ai/dsh-settings": "^0.0.1",
@@ -40,6 +41,7 @@
   },
   "devDependencies": {
     "@deepseek-ai/dsh-credentials": "workspace:^",
+    "@deepseek-ai/dsh-environment": "workspace:^",
     "@deepseek-ai/dsh-invariants": "workspace:^",
     "@deepseek-ai/dsh-llm": "workspace:^",
     "@deepseek-ai/dsh-settings": "workspace:^",

packages/llm/llm-deepseek/src/index.ts

@@ -16,6 +16,7 @@ import z from 'schemastery'
 import { LlmError, resolveRetryPolicy, RetryPolicySchema } from '@deepseek-ai/dsh-llm'
 import type { RetryPolicyConfig } from '@deepseek-ai/dsh-llm'
 import { credentialRef } from '@deepseek-ai/dsh-credentials'
+import { environmentOf, type EnvironmentSnapshot } from '@deepseek-ai/dsh-environment'
 import { deepEqualJson, installSettingsSection, settingsNamespace } from '@deepseek-ai/dsh-settings'
 import { MAX_TIMER_DELAY_MS } from '@deepseek-ai/dsh-timeout'
 import {
@@ -62,7 +63,7 @@ export interface Config {
   apiKey?: string
   /** Credential reference (environment-variable name) resolved per request; defaults to `DEEPSEEK_API_KEY`. */
   apiKeyEnv?: string
-  /** Endpoint base; falls back to $DEEPSEEK_BASE_URL, then the public API. */
+  /** Endpoint base; falls back to $DEEPSEEK_BASE_URL from a trusted environment layer, then the public API. */
   baseURL?: string
   /** Deployment thinking policy; `disabled` limits every conversation request to `off`. */
   thinking?: 'enabled' | 'disabled'
@@ -103,6 +104,9 @@ export const Config: z<Config> = z.object({
 /** Public API default; the internal endpoint comes from $DEEPSEEK_BASE_URL. */
 export const PUBLIC_BASE_URL = 'https://api.deepseek.com'
 
+/** Environment variable naming this provider's endpoint, honored only from trusted layers. */
+const BASE_URL_ENV = 'DEEPSEEK_BASE_URL'
+
 /**
  * One resolution's complete request facts. Connection and credential facts
  * are one value on purpose: a snapshot the resolver rejects keeps the whole
@@ -142,9 +146,13 @@ function resolveModels(models: readonly DeepSeekCatalogModel[] | undefined): Dee
  * every default and bound is re-judged here — for the composition entry at
  * load (fail loud) and for each settings snapshot at its first use.
  * @param config - raw plugin config or resolved settings snapshot.
+ * @param environment - this run's environment layers, or `undefined` outside
+ * the product CLI. Only the launching shell and the user's own `.env` may
+ * supply an endpoint: a base URL decides where the resolved API key is sent,
+ * so a file inside the workspace must not be able to redirect it.
  * @returns validated connection facts plus the credential reference.
  */
-export function resolveAdapterOptions(config: Config): ResolvedDeepSeekOptions {
+export function resolveAdapterOptions(config: Config, environment?: EnvironmentSnapshot): ResolvedDeepSeekOptions {
   if (config.thinking === 'disabled'
     && config.reasoningEffort !== undefined
     && config.reasoningEffort !== 'off') {
@@ -169,7 +177,9 @@ export function resolveAdapterOptions(config: Config): ResolvedDeepSeekOptions {
   return {
     ...config.apiKey !== undefined && config.apiKey.length > 0 ? { apiKey: config.apiKey } : {},
     apiKeyEnv: credentialRef(config.apiKeyEnv ?? DEFAULT_API_KEY_ENV),
-    baseURL: config.baseURL ?? process.env.DEEPSEEK_BASE_URL ?? PUBLIC_BASE_URL,
+    baseURL: config.baseURL
+      ?? environment?.getFrom(BASE_URL_ENV, ['process', 'user-env'])?.value
+      ?? PUBLIC_BASE_URL,
     defaults: {
       thinking: config.thinking,
       reasoningEffort: config.reasoningEffort,
@@ -190,7 +200,7 @@ export function apply(ctx: Context, config: Config): void {
     const raw = current()
     if (raw === lastRaw && lastGood !== undefined) return lastGood
     try {
-      const next = resolveAdapterOptions(raw)
+      const next = resolveAdapterOptions(raw, environmentOf(ctx))
       lastRaw = raw
       lastGood = next
       return next
@@ -217,10 +227,12 @@ export function apply(ctx: Context, config: Config): void {
       const hit = await credentials.resolve(ref)
       if (hit !== undefined) return hit.value
     } else {
-      // Without the seam, keep the historical ambient fallback so a plain
-      // cordis.yml composition works from the environment alone.
-      const ambient = process.env[ref]
-      if (ambient !== undefined && ambient.length > 0) return ambient
+      // Without the seam there is no managed store to rank against, so the
+      // launching environment is the whole credential plane — but only that
+      // layer: a key from a discovered project file would route this request
+      // through an account the launch never chose.
+      const inherited = environmentOf(ctx).getFrom(ref, ['process'])
+      if (inherited !== undefined && inherited.value.length > 0) return inherited.value
     }
     throw new LlmError(
       `llm-deepseek: no API key for provider route "${PROVIDER}"; store ${ref} through the credentials`

packages/llm/llm-deepseek/tests/adapter.spec.ts

@@ -1,5 +1,6 @@
 import { afterEach, describe, expect, it, vi } from 'vitest'
 import { Context } from 'cordis'
+import { createEnvironmentSnapshot } from '@deepseek-ai/dsh-environment'
 import LlmService, { createUserMessage,
   CONTEXT_WINDOW_EXCEEDED_CODE,
   errorChain,
@@ -12,7 +13,7 @@ import LlmService, { createUserMessage,
 import { MAX_TIMER_DELAY_MS } from '@deepseek-ai/dsh-timeout'
 import { SessionId } from '@deepseek-ai/dsh-session'
 import * as LlmDeepSeek from '@deepseek-ai/dsh-llm-deepseek'
-import { DeepSeekAdapter, resolveAdapterOptions } from '@deepseek-ai/dsh-llm-deepseek'
+import { DeepSeekAdapter, PUBLIC_BASE_URL, resolveAdapterOptions } from '@deepseek-ai/dsh-llm-deepseek'
 import { httpErrorCode } from '../src/adapter.ts'
 import { assemble } from './assemble.ts'
 import { closeMockServers, mockServer, textEvents } from './mock-server.ts'
@@ -906,6 +907,25 @@ describe('plugin registration and config', () => {
     expect(server.requests).toHaveLength(1)
   })
 
+
+  it('takes DEEPSEEK_BASE_URL from the launching shell or the user .env, never from the project', () => {
+    const trusted = createEnvironmentSnapshot([
+      { source: 'user-env', path: '/home/.dsh/.env', values: { DEEPSEEK_BASE_URL: 'https://user.example' } },
+    ])
+    expect(resolveAdapterOptions({}, trusted).baseURL).toBe('https://user.example')
+    // A base URL decides where the resolved API key is sent, so a file inside
+    // a model-writable workspace must not be able to redirect it.
+    const project = createEnvironmentSnapshot([
+      { source: 'project-env', path: '/work/.env', values: { DEEPSEEK_BASE_URL: 'https://attacker.example' } },
+    ])
+    expect(resolveAdapterOptions({}, project).baseURL).toBe(PUBLIC_BASE_URL)
+    // An explicitly configured endpoint outranks every environment layer, so a
+    // stale shell value cannot rewrite a deployment's own gateway.
+    const shell = createEnvironmentSnapshot([
+      { source: 'process', values: { DEEPSEEK_BASE_URL: 'https://stale.example' } },
+    ])
+    expect(resolveAdapterOptions({ baseURL: 'https://gateway.internal' }, shell).baseURL).toBe('https://gateway.internal')
+  })
   it('defaults to the public base URL without config or env', async () => {
     vi.stubEnv('DEEPSEEK_API_KEY', 'k')
     vi.stubEnv('DEEPSEEK_BASE_URL', undefined)

packages/llm/llm-deepseek/tsconfig.json

@@ -23,6 +23,9 @@
     {
       "path": "../../credentials/credentials"
     },
+    {
+      "path": "../../util/environment"
+    },
     {
       "path": "../../settings/settings"
     },

packages/llm/llm-pi-ai/package.json

@@ -28,6 +28,7 @@
   "license": "BSD-3-Clause",
   "peerDependencies": {
     "@deepseek-ai/dsh-credentials": "^0.0.1",
+    "@deepseek-ai/dsh-environment": "^0.0.1",
     "@deepseek-ai/dsh-invariants": "^0.0.1",
     "@deepseek-ai/dsh-llm": "^0.0.1",
     "@deepseek-ai/dsh-settings": "^0.0.1",
@@ -40,6 +41,7 @@
   },
   "devDependencies": {
     "@deepseek-ai/dsh-credentials": "workspace:^",
+    "@deepseek-ai/dsh-environment": "workspace:^",
     "@deepseek-ai/dsh-invariants": "workspace:^",
     "@deepseek-ai/dsh-llm": "workspace:^",
     "@deepseek-ai/dsh-llm-deepseek": "workspace:^",

packages/llm/llm-pi-ai/src/index.ts

@@ -29,6 +29,7 @@
  */
 
 import type { Context } from 'cordis'
+import { environmentOf } from '@deepseek-ai/dsh-environment'
 import { getBuiltinProviders } from '@earendil-works/pi-ai/providers/all'
 import { LlmError } from '@deepseek-ai/dsh-llm'
 import type { AdapterRegistrationHandle } from '@deepseek-ai/dsh-llm'
@@ -99,9 +100,9 @@ export function apply(ctx: Context, config: Config): void {
     const credentials = ctx.get('credentials')
     const hit = credentials !== undefined
       ? (await credentials.resolve(ref))?.value
-      // Without the seam, read exactly the named variable so a plain
-      // cordis.yml composition works from the environment alone.
-      : process.env[ref]
+      // Without the seam the launching environment is the whole credential
+      // plane — but only that layer, never a discovered project file.
+      : environmentOf(ctx).getFrom(ref, ['process'])?.value
     if (hit !== undefined && hit.length > 0) return hit
     throw new LlmError(
       `llm-pi-ai: no credential for provider route "${provider}"; its profile resolves ${ref}, which is not`

packages/llm/llm-pi-ai/tsconfig.json

@@ -8,6 +8,9 @@
     "src"
   ],
   "references": [
+    {
+      "path": "../../util/environment"
+    },
     {
       "path": "../../../vendor/cosmokit"
     },