diff --git a/server/providers/common/textInstructions.js b/server/providers/common/textInstructions.js
index 6efd596d0..ff4d62bbc 100644
--- a/server/providers/common/textInstructions.js
+++ b/server/providers/common/textInstructions.js
@@ -15,8 +15,9 @@ export const TEXT_WORDING = Object.freeze([
 
 // Shared-manual adaptation follows Darren Dignam's GEV COMMAND approach (#976).
 // Keep our Radio handoff and annotation outcome policies from the shared manual.
-export function textInstructions(annotationGuidance) {
-  return realtimeDirectives(annotationGuidance)
+// `options.overpass` matches the tools offered, as for voice.
+export function textInstructions(annotationGuidance, options) {
+  return realtimeDirectives(annotationGuidance, options)
     .map((line, index) => {
       if (index === 0)
         return "You are GEV Chat, a concise text assistant for a Cesium geospatial app called God's Eye View.";
diff --git a/server/providers/gemini/chat.js b/server/providers/gemini/chat.js
index 73e10502d..4e4dbea45 100644
--- a/server/providers/gemini/chat.js
+++ b/server/providers/gemini/chat.js
@@ -1,7 +1,8 @@
 import { createTextChatHandler } from '../common/textChat.js';
 import { invalidCalls } from '../common/textTools.js';
 import { textInstructions } from '../common/textInstructions.js';
-import { GEV_REALTIME_TOOLS } from '../openai/tools.js';
+import { GEV_REALTIME_TOOLS, offeredTools } from '../openai/tools.js';
+import { resolveOverpassUpstreams } from '../overpass/constants.js';
 import { normalizeGeminiModel } from './config.js';
 
 // The Gemini token route's throttle default (GEV_RATELIMIT_GEMINI_PER_MIN).
@@ -80,6 +81,9 @@ export function validChatContents(contents, names) {
 export function createGeminiChatHandler({
   annotationGuidance,
   tools = GEV_REALTIME_TOOLS,
+  // osm_query is offered, and the prompt names it, only with Overpass, as
+  // for voice.
+  overpassConfigured = () => resolveOverpassUpstreams().length > 0,
   resolveChatModel = () =>
     process.env.GEMINI_CHAT_MODEL || 'gemini-3.5-flash-lite',
   resolveApiKey = () => process.env.GEMINI_API_KEY,
@@ -102,17 +106,20 @@ export function createGeminiChatHandler({
       )
         return null;
       if (!pairedContents(input.contents)) return null;
+      const overpass = overpassConfigured();
       return {
         endpoint: `https://generativelanguage.googleapis.com/v1beta/models/${model}:generateContent`,
         headers: (key) => ({ 'x-goog-api-key': key }),
         body: {
           contents: input.contents,
           systemInstruction: {
-            parts: [{ text: textInstructions(annotationGuidance) }],
+            parts: [
+              { text: textInstructions(annotationGuidance, { overpass }) },
+            ],
           },
           tools: [
             {
-              functionDeclarations: tools.map(
+              functionDeclarations: offeredTools(tools, { overpass }).map(
                 ({ name, description, parameters }) => ({
                   name,
                   description,
@@ -144,7 +151,10 @@ export function createGeminiChatHandler({
       return {
         content,
         finishReason: candidate.finishReason,
-        invalidCalls: invalidCalls(calls, tools),
+        invalidCalls: invalidCalls(
+          calls,
+          offeredTools(tools, { overpass: overpassConfigured() }),
+        ),
       };
     },
   });
diff --git a/server/providers/openai/chat.js b/server/providers/openai/chat.js
index cd0123486..413d69ba9 100644
--- a/server/providers/openai/chat.js
+++ b/server/providers/openai/chat.js
@@ -3,7 +3,8 @@ import { preferCodexOAuth } from './codex-auth.js';
 import { OPENAI_DEFAULT_PER_MIN } from './rate-limit.js';
 import { invalidCalls } from '../common/textTools.js';
 import { textInstructions } from '../common/textInstructions.js';
-import { GEV_REALTIME_TOOLS } from './tools.js';
+import { GEV_REALTIME_TOOLS, offeredTools } from './tools.js';
+import { resolveOverpassUpstreams } from '../overpass/constants.js';
 
 const object = (value) =>
   value && typeof value === 'object' && !Array.isArray(value);
@@ -66,6 +67,9 @@ function validMessages(messages) {
 export function createOpenAiChatHandler({
   annotationGuidance,
   tools = GEV_REALTIME_TOOLS,
+  // osm_query is offered, and the prompt names it, only with Overpass, as
+  // for voice.
+  overpassConfigured = () => resolveOverpassUpstreams().length > 0,
   resolveApiKey = () => process.env.OPENAI_API_KEY,
   resolveChatModel = () => process.env.OPENAI_CHAT_MODEL || 'gpt-4.1-mini',
   resolveProviderRateLimit = () => process.env.GEV_RATELIMIT_OPENAI_PER_MIN,
@@ -102,6 +106,7 @@ export function createOpenAiChatHandler({
         !validMessages(input.messages)
       )
         return null;
+      const overpass = overpassConfigured();
       return {
         endpoint: 'https://api.openai.com/v1/chat/completions',
         headers: (key) => ({ Authorization: `Bearer ${key}` }),
@@ -112,13 +117,18 @@ export function createOpenAiChatHandler({
           store: false,
           max_completion_tokens: 4096,
           messages: [
-            { role: 'system', content: textInstructions(annotationGuidance) },
+            {
+              role: 'system',
+              content: textInstructions(annotationGuidance, { overpass }),
+            },
             ...input.messages,
           ],
-          tools: tools.map(({ name, description, parameters }) => ({
-            type: 'function',
-            function: { name, description, parameters, strict: false },
-          })),
+          tools: offeredTools(tools, { overpass }).map(
+            ({ name, description, parameters }) => ({
+              type: 'function',
+              function: { name, description, parameters, strict: false },
+            }),
+          ),
         },
       };
     },
@@ -149,7 +159,10 @@ export function createOpenAiChatHandler({
       return {
         content,
         finishReason: choice.finish_reason,
-        invalidCalls: invalidCalls(calls, tools),
+        invalidCalls: invalidCalls(
+          calls,
+          offeredTools(tools, { overpass: overpassConfigured() }),
+        ),
       };
     },
   });
diff --git a/src/textChatServer.test.mjs b/src/textChatServer.test.mjs
index bd1dddbfb..61b09e987 100644
--- a/src/textChatServer.test.mjs
+++ b/src/textChatServer.test.mjs
@@ -4,6 +4,7 @@ import http from 'node:http';
 import { once } from 'node:events';
 import { createGeminiChatHandler } from '../server/providers/gemini/chat.js';
 import { createOpenAiChatHandler } from '../server/providers/openai/chat.js';
+import { GEV_REALTIME_TOOLS } from '../server/providers/openai/tools.js';
 import {
   realtimeDirectives,
   realtimeInstructions,
@@ -514,6 +515,27 @@ for (const [name, provider] of Object.entries(providers)) {
     assert.equal((await (await unread.send()).json()).code, 'API_KEY_REJECTED');
     assert.equal(cancelled, true);
   });
+  test(`${name} offers osm_query, and names it, only with Overpass, as voice does`, async (t) => {
+    for (const overpass of [false, true]) {
+      const f = await fixture(t, provider, undefined, {
+        tools: GEV_REALTIME_TOOLS,
+        overpassConfigured: () => overpass,
+      });
+      assert.equal((await f.send()).status, 200);
+      const { body } = f.calls[0];
+      const offered =
+        name === 'openai'
+          ? body.tools.map((tool) => tool.function.name)
+          : body.tools[0].functionDeclarations.map((tool) => tool.name);
+      const prompt =
+        name === 'openai'
+          ? body.messages[0].content
+          : body.systemInstruction.parts[0].text;
+      assert.equal(offered.includes('osm_query'), overpass);
+      assert.equal(prompt.includes('osm_query'), overpass);
+      assert.ok(offered.includes('resolve_area'));
+    }
+  });
   test(`${name} throttled replies say they are rate limited`, async (t) => {
     const local = await fixture(t, provider, undefined, {
       resolveRateLimit: () => '1',