diff --git a/.changeset/print-mode-env-provider-key.md b/.changeset/print-mode-env-provider-key.md
new file mode 100644
index 0000000000..237d9bbc37
--- /dev/null
+++ b/.changeset/print-mode-env-provider-key.md
@@ -0,0 +1,5 @@
+---
+"@moonshot-ai/kimi-code": patch
+---
+
+Fix `kimi -p` refusing to start with an environment-supplied provider key: the auth readiness gate looked the vendor's declared `apiKeyEnv` up in the provider's `env` bag alone, so a key present only in the process environment was reported as `provider <id> has no credential configured` even though the adapter issuing the request would have read it. The gate now falls back to the process environment, with an explicit `[providers.<id>.env]` entry still taking precedence.
diff --git a/packages/agent-core-v2/src/kosong/model/modelAuth.ts b/packages/agent-core-v2/src/kosong/model/modelAuth.ts
index e2a923edd4..340348b600 100644
--- a/packages/agent-core-v2/src/kosong/model/modelAuth.ts
+++ b/packages/agent-core-v2/src/kosong/model/modelAuth.ts
@@ -62,25 +62,35 @@ export function resolveModelAuthMaterial(
   }
 
   const providerAuthType = args.provider?.type ?? args.model.protocol;
-  const providerEndpoint =
+
+  // Explicitly configured credentials are resolved first and in isolation: the
+  // provider's own `env` bag must not have to compete with ambient process env,
+  // or a vendor whose endpoint chain declares several keys (google-genai lists
+  // VERTEXAI_API_KEY ahead of GOOGLE_API_KEY) could resolve an ambient key in
+  // preference to the one the user configured.
+  const configuredEndpoint =
     providerAuthType === undefined
       ? {}
       : explainProviderEndpoint(providerAuthType, args.provider?.env ?? {});
-  const providerApiKey = nonEmpty(args.provider?.apiKey) ?? nonEmpty(providerEndpoint.apiKey);
-  if (providerApiKey !== undefined && args.provider?.oauth !== undefined) {
+  const configuredApiKey = nonEmpty(args.provider?.apiKey) ?? nonEmpty(configuredEndpoint.apiKey);
+
+  // Only explicitly configured credentials participate in the apiKey/oauth
+  // conflict check. An unrelated key that merely happens to exist in the shell
+  // must never invalidate a working oauth provider.
+  if (configuredApiKey !== undefined && args.provider?.oauth !== undefined) {
     throw authConflictError('Provider', args.providerName);
   }
-  if (providerApiKey !== undefined) {
+  if (configuredApiKey !== undefined) {
     trace?.record(
       'resolved.auth',
       nonEmpty(args.provider?.apiKey) !== undefined
         ? { kind: 'config', detail: `provider '${args.providerName}' apiKey` }
         : {
             kind: 'env',
-            detail: `${providerEndpoint.apiKeyEnvName ?? '?'} (provider '${args.providerName}' env bag)`,
+            detail: `${configuredEndpoint.apiKeyEnvName ?? '?'} (provider '${args.providerName}' env bag)`,
           },
     );
-    return { apiKey: providerApiKey };
+    return { apiKey: configuredApiKey };
   }
   if (args.provider?.oauth !== undefined) {
     trace?.record('resolved.auth', {
@@ -92,6 +102,20 @@ export function resolveModelAuthMaterial(
       oauthProviderKey: args.model.providerId ?? args.model.provider,
     };
   }
+
+  // Nothing was configured anywhere. Fall back to the ambient process env, which
+  // is what the adapters themselves read when they construct the request; without
+  // this the readiness gate is stricter than the code it guards.
+  const ambientEndpoint =
+    providerAuthType === undefined ? {} : explainProviderEndpoint(providerAuthType, process.env);
+  const ambientApiKey = nonEmpty(ambientEndpoint.apiKey);
+  if (ambientApiKey !== undefined) {
+    trace?.record('resolved.auth', {
+      kind: 'env',
+      detail: `${ambientEndpoint.apiKeyEnvName ?? '?'} (process env)`,
+    });
+    return { apiKey: ambientApiKey };
+  }
   trace?.record('resolved.auth', {
     kind: 'none',
     detail: 'no credential resolved at any layer (adapter construction may still read process.env)',
diff --git a/packages/agent-core-v2/test/kosong/model/modelAuth.test.ts b/packages/agent-core-v2/test/kosong/model/modelAuth.test.ts
index ec7540a765..682801be27 100644
--- a/packages/agent-core-v2/test/kosong/model/modelAuth.test.ts
+++ b/packages/agent-core-v2/test/kosong/model/modelAuth.test.ts
@@ -12,7 +12,7 @@
  *    profile — inferred only for vendors whose thinking is not trait-driven.
  */
 
-import { describe, expect, it } from 'vitest';
+import { afterEach, describe, expect, it, vi } from 'vitest';
 
 import { ConfigErrors } from '#/app/config/errors';
 import '#/kosong/provider/providers/kimi/kimi.contrib';
@@ -101,10 +101,85 @@ describe('resolveModelAuthMaterial', () => {
     ).toEqual({ apiKey: 'vertex-env-key' });
   });
 
+  it('falls back to the process environment when the provider declares no env bag', () => {
+    vi.stubEnv('OPENAI_API_KEY', 'process-env-key');
+    expect(authMaterial({ model: { model: 'm' }, provider: { type: 'openai' } })).toEqual({
+      apiKey: 'process-env-key',
+    });
+  });
+
+  it('prefers the provider env bag and inline apiKey over the process environment', () => {
+    vi.stubEnv('OPENAI_API_KEY', 'process-env-key');
+    expect(
+      authMaterial({
+        model: { model: 'm' },
+        provider: { type: 'openai', env: { OPENAI_API_KEY: 'bag-key' } },
+      }),
+    ).toEqual({ apiKey: 'bag-key' });
+    expect(
+      authMaterial({
+        model: { model: 'm' },
+        provider: { type: 'openai', apiKey: 'inline-key' },
+      }),
+    ).toEqual({ apiKey: 'inline-key' });
+  });
+
+  it('prefers a configured env-bag key over an ambient key declared earlier in the chain', () => {
+    // google-genai declares VERTEXAI_API_KEY ahead of GOOGLE_API_KEY, so an
+    // ambient Vertex key must not outrank the Gemini key the user configured.
+    vi.stubEnv('VERTEXAI_API_KEY', 'ambient-vertex-key');
+    expect(
+      authMaterial({
+        model: { model: 'm' },
+        provider: { type: 'google-genai', env: { GOOGLE_API_KEY: 'configured-google-key' } },
+      }),
+    ).toEqual({ apiKey: 'configured-google-key' });
+  });
+
+  it('does not let an ambient key invalidate a provider configured for oauth', () => {
+    vi.stubEnv('OPENAI_API_KEY', 'ambient-unrelated-key');
+    expect(
+      authMaterial({
+        model: { model: 'm', providerId: 'p1' },
+        provider: { type: 'openai', oauth: { storage: 'file', key: 'k' } },
+      }),
+    ).toEqual({ oauth: { storage: 'file', key: 'k' }, oauthProviderKey: 'p1' });
+  });
+
+  it('still rejects a configured apiKey alongside oauth', () => {
+    expect(() =>
+      authMaterial({
+        model: { model: 'm' },
+        provider: { type: 'openai', apiKey: 'k', oauth: { storage: 'file', key: 'k' } },
+      }),
+    ).toThrowError(expect.objectContaining({ code: ConfigErrors.codes.CONFIG_INVALID }));
+    expect(() =>
+      authMaterial({
+        model: { model: 'm' },
+        provider: {
+          type: 'openai',
+          env: { OPENAI_API_KEY: 'bag-key' },
+          oauth: { storage: 'file', key: 'k' },
+        },
+      }),
+    ).toThrowError(expect.objectContaining({ code: ConfigErrors.codes.CONFIG_INVALID }));
+  });
+
+  it('does not leak an unrelated vendor key from the process environment', () => {
+    vi.stubEnv('OPENAI_API_KEY', 'process-env-key');
+    vi.stubEnv('ANTHROPIC_API_KEY', '');
+    expect(authMaterial({ model: { model: 'm' }, provider: { type: 'anthropic' } })).toEqual({});
+  });
+
   it('returns empty material when nothing is configured', () => {
+    vi.stubEnv('OPENAI_API_KEY', '');
     expect(authMaterial({ model: { model: 'm' }, provider: { type: 'openai' } })).toEqual({});
     expect(authMaterial({ model: { model: 'm' } })).toEqual({});
   });
+
+  afterEach(() => {
+    vi.unstubAllEnvs();
+  });
 });
 
 describe('effectiveModelConfig', () => {