Add MCP tool for replying to posts

Add MCP tool for retrieving post details

backend/src/main/java/com/openisle/controller/CommentController.java

@@ -1,11 +1,13 @@
 package com.openisle.controller;
 
+import com.openisle.dto.CommentContextDto;
 import com.openisle.dto.CommentDto;
 import com.openisle.dto.CommentRequest;
 import com.openisle.dto.PostChangeLogDto;
 import com.openisle.dto.TimelineItemDto;
 import com.openisle.mapper.CommentMapper;
 import com.openisle.mapper.PostChangeLogMapper;
+import com.openisle.mapper.PostMapper;
 import com.openisle.model.Comment;
 import com.openisle.model.CommentSort;
 import com.openisle.service.*;
@@ -40,6 +42,7 @@ public class CommentController {
   private final PointService pointService;
   private final PostChangeLogService changeLogService;
   private final PostChangeLogMapper postChangeLogMapper;
+  private final PostMapper postMapper;
 
   @Value("${app.captcha.enabled:false}")
   private boolean captchaEnabled;
@@ -184,6 +187,37 @@ public class CommentController {
     return itemDtoList;
   }
 
+  @GetMapping("/comments/{commentId}/context")
+  @Operation(
+    summary = "Comment context",
+    description = "Get a comment along with its previous comments and related post"
+  )
+  @ApiResponse(
+    responseCode = "200",
+    description = "Comment context",
+    content = @Content(schema = @Schema(implementation = CommentContextDto.class))
+  )
+  public ResponseEntity<CommentContextDto> getCommentContext(@PathVariable Long commentId) {
+    log.debug("getCommentContext called for comment {}", commentId);
+    Comment comment = commentService.getComment(commentId);
+    CommentContextDto dto = new CommentContextDto();
+    dto.setPost(postMapper.toSummaryDto(comment.getPost()));
+    dto.setTargetComment(commentMapper.toDtoWithReplies(comment));
+    dto.setPreviousComments(
+      commentService
+        .getCommentsBefore(comment)
+        .stream()
+        .map(commentMapper::toDtoWithReplies)
+        .collect(Collectors.toList())
+    );
+    log.debug(
+      "getCommentContext returning {} previous comments for comment {}",
+      dto.getPreviousComments().size(),
+      commentId
+    );
+    return ResponseEntity.ok(dto);
+  }
+
   @DeleteMapping("/comments/{id}")
   @Operation(summary = "Delete comment", description = "Delete a comment")
   @ApiResponse(responseCode = "200", description = "Deleted")

backend/src/main/java/com/openisle/controller/PostController.java

@@ -224,6 +224,26 @@ public class PostController {
       .collect(Collectors.toList());
   }
 
+  @GetMapping("/recent")
+  @Operation(
+    summary = "Recent posts",
+    description = "List posts created within the specified number of minutes"
+  )
+  @ApiResponse(
+    responseCode = "200",
+    description = "Recent posts",
+    content = @Content(
+      array = @ArraySchema(schema = @Schema(implementation = PostSummaryDto.class))
+    )
+  )
+  public List<PostSummaryDto> recentPosts(@RequestParam("minutes") int minutes) {
+    return postService
+      .listRecentPosts(minutes)
+      .stream()
+      .map(postMapper::toSummaryDto)
+      .collect(Collectors.toList());
+  }
+
   @GetMapping("/ranking")
   @Operation(summary = "Ranking posts", description = "List posts by view rankings")
   @ApiResponse(

backend/src/main/java/com/openisle/dto/CommentContextDto.java

@@ -0,0 +1,15 @@
+package com.openisle.dto;
+
+import java.util.List;
+import lombok.Data;
+
+/**
+ * DTO representing the context of a comment including its post and previous comments.
+ */
+@Data
+public class CommentContextDto {
+
+  private PostSummaryDto post;
+  private CommentDto targetComment;
+  private List<CommentDto> previousComments;
+}

backend/src/main/java/com/openisle/repository/CommentRepository.java

@@ -3,6 +3,7 @@ package com.openisle.repository;
 import com.openisle.model.Comment;
 import com.openisle.model.Post;
 import com.openisle.model.User;
+import java.time.LocalDateTime;
 import java.util.List;
 import org.springframework.data.domain.Pageable;
 import org.springframework.data.jpa.repository.JpaRepository;
@@ -10,6 +11,10 @@ import org.springframework.data.jpa.repository.JpaRepository;
 public interface CommentRepository extends JpaRepository<Comment, Long> {
   List<Comment> findByPostAndParentIsNullOrderByCreatedAtAsc(Post post);
   List<Comment> findByParentOrderByCreatedAtAsc(Comment parent);
+  List<Comment> findByPostAndCreatedAtLessThanOrderByCreatedAtAsc(
+    Post post,
+    LocalDateTime createdAt
+  );
   List<Comment> findByAuthorOrderByCreatedAtDesc(User author, Pageable pageable);
   List<Comment> findByContentContainingIgnoreCase(String keyword);
 

backend/src/main/java/com/openisle/repository/PostRepository.java

@@ -19,6 +19,10 @@ public interface PostRepository extends JpaRepository<Post, Long> {
   List<Post> findByStatusOrderByCreatedAtDesc(PostStatus status, Pageable pageable);
   List<Post> findByStatusOrderByViewsDesc(PostStatus status);
   List<Post> findByStatusOrderByViewsDesc(PostStatus status, Pageable pageable);
+  List<Post> findByStatusAndCreatedAtGreaterThanEqualOrderByCreatedAtDesc(
+    PostStatus status,
+    LocalDateTime createdAt
+  );
   List<Post> findByAuthorAndStatusOrderByCreatedAtDesc(
     User author,
     PostStatus status,

backend/src/main/java/com/openisle/service/CommentService.java

@@ -266,6 +266,27 @@ public class CommentService {
     return replies;
   }
 
+  public Comment getComment(Long commentId) {
+    log.debug("getComment called for id {}", commentId);
+    return commentRepository
+      .findById(commentId)
+      .orElseThrow(() -> new com.openisle.exception.NotFoundException("Comment not found"));
+  }
+
+  public List<Comment> getCommentsBefore(Comment comment) {
+    log.debug("getCommentsBefore called for comment {}", comment.getId());
+    List<Comment> comments = commentRepository.findByPostAndCreatedAtLessThanOrderByCreatedAtAsc(
+      comment.getPost(),
+      comment.getCreatedAt()
+    );
+    log.debug(
+      "getCommentsBefore returning {} comments for comment {}",
+      comments.size(),
+      comment.getId()
+    );
+    return comments;
+  }
+
   public List<Comment> getRecentCommentsByUser(String username, int limit) {
     log.debug("getRecentCommentsByUser called for user {} with limit {}", username, limit);
     User user = userRepository

backend/src/main/java/com/openisle/service/PostService.java

@@ -770,6 +770,18 @@ public class PostService {
     return listPostsByCategories(null, null, null);
   }
 
+  public List<Post> listRecentPosts(int minutes) {
+    if (minutes <= 0) {
+      throw new IllegalArgumentException("Minutes must be positive");
+    }
+    LocalDateTime since = LocalDateTime.now().minusMinutes(minutes);
+    List<Post> posts = postRepository.findByStatusAndCreatedAtGreaterThanEqualOrderByCreatedAtDesc(
+      PostStatus.PUBLISHED,
+      since
+    );
+    return sortByPinnedAndCreated(posts);
+  }
+
   public List<Post> listPostsByViews(Integer page, Integer pageSize) {
     return listPostsByViews(null, null, page, pageSize);
   }

mcp/README.md

@@ -31,7 +31,11 @@ By default the server listens on port `8085` and serves MCP over Streamable HTTP
 | Tool | Description |
 | --- | --- |
 | `search` | Perform a global search against the OpenIsle backend. |
+| `reply_to_post` | Create a new comment on a post using a JWT token. |
+| `reply_to_comment` | Reply to an existing comment using a JWT token. |
+| `recent_posts` | Retrieve posts created within the last *N* minutes. |
 
-The tool returns structured data describing each search hit including highlighted snippets when
+The tools return structured data mirroring the backend DTOs, including highlighted snippets for
-provided by the backend.
+search results, the full comment payload for post replies and comment replies, and detailed
+metadata for recent posts.
 

mcp/src/openisle_mcp/schemas.py

@@ -2,7 +2,8 @@
 
 from __future__ import annotations
 
-from typing import Optional
+from datetime import datetime
+from typing import Any, Optional
 
 from pydantic import BaseModel, Field, ConfigDict
 
@@ -53,3 +54,226 @@ class SearchResponse(BaseModel):
         description="Ordered collection of search results.",
     )
 
+
+class AuthorInfo(BaseModel):
+    """Summary of a post or comment author."""
+
+    id: Optional[int] = Field(default=None, description="Author identifier.")
+    username: Optional[str] = Field(default=None, description="Author username.")
+    avatar: Optional[str] = Field(default=None, description="URL of the author's avatar.")
+    display_medal: Optional[str] = Field(
+        default=None,
+        alias="displayMedal",
+        description="Medal displayed next to the author, when available.",
+    )
+
+    model_config = ConfigDict(populate_by_name=True, extra="allow")
+
+
+class CategoryInfo(BaseModel):
+    """Basic information about a post category."""
+
+    id: Optional[int] = Field(default=None, description="Category identifier.")
+    name: Optional[str] = Field(default=None, description="Category name.")
+    description: Optional[str] = Field(
+        default=None, description="Human friendly description of the category."
+    )
+    icon: Optional[str] = Field(default=None, description="Icon URL associated with the category.")
+    small_icon: Optional[str] = Field(
+        default=None,
+        alias="smallIcon",
+        description="Compact icon URL for the category.",
+    )
+    count: Optional[int] = Field(default=None, description="Number of posts within the category.")
+
+    model_config = ConfigDict(populate_by_name=True, extra="allow")
+
+
+class TagInfo(BaseModel):
+    """Details for a tag assigned to a post."""
+
+    id: Optional[int] = Field(default=None, description="Tag identifier.")
+    name: Optional[str] = Field(default=None, description="Tag name.")
+    description: Optional[str] = Field(default=None, description="Description of the tag.")
+    icon: Optional[str] = Field(default=None, description="Icon URL for the tag.")
+    small_icon: Optional[str] = Field(
+        default=None,
+        alias="smallIcon",
+        description="Compact icon URL for the tag.",
+    )
+    created_at: Optional[datetime] = Field(
+        default=None,
+        alias="createdAt",
+        description="When the tag was created.",
+    )
+    count: Optional[int] = Field(default=None, description="Number of posts using the tag.")
+
+    model_config = ConfigDict(populate_by_name=True, extra="allow")
+
+
+class ReactionInfo(BaseModel):
+    """Representation of a reaction on a post or comment."""
+
+    id: Optional[int] = Field(default=None, description="Reaction identifier.")
+    type: Optional[str] = Field(default=None, description="Reaction type (emoji, like, etc.).")
+    user: Optional[str] = Field(default=None, description="Username of the reacting user.")
+    post_id: Optional[int] = Field(
+        default=None,
+        alias="postId",
+        description="Related post identifier when applicable.",
+    )
+    comment_id: Optional[int] = Field(
+        default=None,
+        alias="commentId",
+        description="Related comment identifier when applicable.",
+    )
+    message_id: Optional[int] = Field(
+        default=None,
+        alias="messageId",
+        description="Related message identifier when applicable.",
+    )
+    reward: Optional[int] = Field(default=None, description="Reward granted for the reaction, if any.")
+
+    model_config = ConfigDict(populate_by_name=True, extra="allow")
+
+
+class CommentData(BaseModel):
+    """Comment information returned by the backend."""
+
+    id: Optional[int] = Field(default=None, description="Comment identifier.")
+    content: Optional[str] = Field(default=None, description="Markdown content of the comment.")
+    created_at: Optional[datetime] = Field(
+        default=None,
+        alias="createdAt",
+        description="Timestamp when the comment was created.",
+    )
+    pinned_at: Optional[datetime] = Field(
+        default=None,
+        alias="pinnedAt",
+        description="Timestamp when the comment was pinned, if applicable.",
+    )
+    author: Optional[AuthorInfo] = Field(default=None, description="Author of the comment.")
+    replies: list["CommentData"] = Field(
+        default_factory=list,
+        description="Nested replies associated with the comment.",
+    )
+    reactions: list[ReactionInfo] = Field(
+        default_factory=list,
+        description="Reactions applied to the comment.",
+    )
+    reward: Optional[int] = Field(default=None, description="Reward gained by posting the comment.")
+    point_reward: Optional[int] = Field(
+        default=None,
+        alias="pointReward",
+        description="Points rewarded for the comment.",
+    )
+
+    model_config = ConfigDict(populate_by_name=True, extra="allow")
+
+
+class CommentReplyResult(BaseModel):
+    """Structured response returned when replying to a comment."""
+
+    comment: CommentData = Field(description="Reply comment returned by the backend.")
+
+
+class CommentCreateResult(BaseModel):
+    """Structured response returned when creating a comment on a post."""
+
+    comment: CommentData = Field(description="Comment returned by the backend.")
+
+
+class PostSummary(BaseModel):
+    """Summary information for a post."""
+
+    id: Optional[int] = Field(default=None, description="Post identifier.")
+    title: Optional[str] = Field(default=None, description="Title of the post.")
+    content: Optional[str] = Field(default=None, description="Excerpt or content of the post.")
+    created_at: Optional[datetime] = Field(
+        default=None,
+        alias="createdAt",
+        description="When the post was created.",
+    )
+    author: Optional[AuthorInfo] = Field(default=None, description="Author who created the post.")
+    category: Optional[CategoryInfo] = Field(default=None, description="Category of the post.")
+    tags: list[TagInfo] = Field(default_factory=list, description="Tags assigned to the post.")
+    views: Optional[int] = Field(default=None, description="Total view count for the post.")
+    comment_count: Optional[int] = Field(
+        default=None,
+        alias="commentCount",
+        description="Number of comments on the post.",
+    )
+    status: Optional[str] = Field(default=None, description="Workflow status of the post.")
+    pinned_at: Optional[datetime] = Field(
+        default=None,
+        alias="pinnedAt",
+        description="When the post was pinned, if ever.",
+    )
+    last_reply_at: Optional[datetime] = Field(
+        default=None,
+        alias="lastReplyAt",
+        description="Timestamp of the most recent reply.",
+    )
+    reactions: list[ReactionInfo] = Field(
+        default_factory=list,
+        description="Reactions received by the post.",
+    )
+    participants: list[AuthorInfo] = Field(
+        default_factory=list,
+        description="Users participating in the discussion.",
+    )
+    subscribed: Optional[bool] = Field(
+        default=None,
+        description="Whether the current user is subscribed to the post.",
+    )
+    reward: Optional[int] = Field(default=None, description="Reward granted for the post.")
+    point_reward: Optional[int] = Field(
+        default=None,
+        alias="pointReward",
+        description="Points granted for the post.",
+    )
+    type: Optional[str] = Field(default=None, description="Type of the post.")
+    lottery: Optional[dict[str, Any]] = Field(
+        default=None, description="Lottery information for the post."
+    )
+    poll: Optional[dict[str, Any]] = Field(
+        default=None, description="Poll information for the post."
+    )
+    rss_excluded: Optional[bool] = Field(
+        default=None,
+        alias="rssExcluded",
+        description="Whether the post is excluded from RSS feeds.",
+    )
+    closed: Optional[bool] = Field(default=None, description="Whether the post is closed for replies.")
+    visible_scope: Optional[str] = Field(
+        default=None,
+        alias="visibleScope",
+        description="Visibility scope configuration for the post.",
+    )
+
+    model_config = ConfigDict(populate_by_name=True, extra="allow")
+
+
+class RecentPostsResponse(BaseModel):
+    """Structured response for the recent posts tool."""
+
+    minutes: int = Field(description="Time window, in minutes, used for the query.")
+    total: int = Field(description="Number of posts returned by the backend.")
+    posts: list[PostSummary] = Field(
+        default_factory=list,
+        description="Posts created within the requested time window.",
+    )
+
+
+CommentData.model_rebuild()
+
+
+class PostDetail(PostSummary):
+    """Detailed information for a single post, including comments."""
+
+    comments: list[CommentData] = Field(
+        default_factory=list,
+        description="Comments that belong to the post.",
+    )
+
+    model_config = ConfigDict(populate_by_name=True, extra="allow")

mcp/src/openisle_mcp/search_client.py

@@ -1,4 +1,4 @@
-"""HTTP client helpers for talking to the OpenIsle backend search endpoints."""
+"""HTTP client helpers for talking to the OpenIsle backend endpoints."""
 
 from __future__ import annotations
 
@@ -9,7 +9,7 @@ import httpx
 
 
 class SearchClient:
-    """Client for calling the OpenIsle search API."""
+    """Client for calling the OpenIsle HTTP APIs used by the MCP server."""
 
     def __init__(self, base_url: str, *, timeout: float = 10.0) -> None:
         self._base_url = base_url.rstrip("/")
@@ -35,7 +35,95 @@ class SearchClient:
         if not isinstance(payload, list):
             formatted = json.dumps(payload, ensure_ascii=False)[:200]
             raise ValueError(f"Unexpected response format from search endpoint: {formatted}")
-        return [self._validate_entry(entry) for entry in payload]
+        return [self._ensure_dict(entry) for entry in payload]
+
+    async def reply_to_comment(
+        self,
+        comment_id: int,
+        token: str,
+        content: str,
+        captcha: str | None = None,
+    ) -> dict[str, Any]:
+        """Reply to an existing comment and return the created reply."""
+
+        client = self._get_client()
+        headers = {
+            "Accept": "application/json",
+            "Content-Type": "application/json",
+            "Authorization": f"Bearer {token}",
+        }
+        payload: dict[str, Any] = {"content": content}
+        if captcha is not None:
+            stripped_captcha = captcha.strip()
+            if stripped_captcha:
+                payload["captcha"] = stripped_captcha
+
+        response = await client.post(
+            f"/api/comments/{comment_id}/replies",
+            json=payload,
+            headers=headers,
+        )
+        response.raise_for_status()
+        return self._ensure_dict(response.json())
+
+    async def reply_to_post(
+        self,
+        post_id: int,
+        token: str,
+        content: str,
+        captcha: str | None = None,
+    ) -> dict[str, Any]:
+        """Create a comment on a post and return the backend payload."""
+
+        client = self._get_client()
+        headers = {
+            "Accept": "application/json",
+            "Content-Type": "application/json",
+            "Authorization": f"Bearer {token}",
+        }
+        payload: dict[str, Any] = {"content": content}
+        if captcha is not None:
+            stripped_captcha = captcha.strip()
+            if stripped_captcha:
+                payload["captcha"] = stripped_captcha
+
+        response = await client.post(
+            f"/api/posts/{post_id}/comments",
+            json=payload,
+            headers=headers,
+        )
+        response.raise_for_status()
+        return self._ensure_dict(response.json())
+
+    async def recent_posts(self, minutes: int) -> list[dict[str, Any]]:
+        """Return posts created within the given timeframe."""
+
+        client = self._get_client()
+        response = await client.get(
+            "/api/posts/recent",
+            params={"minutes": minutes},
+            headers={"Accept": "application/json"},
+        )
+        response.raise_for_status()
+        payload = response.json()
+        if not isinstance(payload, list):
+            formatted = json.dumps(payload, ensure_ascii=False)[:200]
+            raise ValueError(
+                f"Unexpected response format from recent posts endpoint: {formatted}"
+            )
+        return [self._ensure_dict(entry) for entry in payload]
+
+    async def get_post(self, post_id: int, token: str | None = None) -> dict[str, Any]:
+        """Retrieve the detailed payload for a single post."""
+
+        client = self._get_client()
+        headers = {"Accept": "application/json"}
+        if token:
+            headers["Authorization"] = f"Bearer {token}"
+
+        response = await client.get(f"/api/posts/{post_id}", headers=headers)
+        response.raise_for_status()
+        return self._ensure_dict(response.json())
 
     async def aclose(self) -> None:
         """Dispose of the underlying HTTP client."""
@@ -45,7 +133,7 @@ class SearchClient:
             self._client = None
 
     @staticmethod
-    def _validate_entry(entry: Any) -> dict[str, Any]:
+    def _ensure_dict(entry: Any) -> dict[str, Any]:
         if not isinstance(entry, dict):
-            raise ValueError(f"Search entry must be an object, got: {type(entry)!r}")
+            raise ValueError(f"Expected JSON object, got: {type(entry)!r}")
         return entry

mcp/src/openisle_mcp/server.py

@@ -11,7 +11,16 @@ from pydantic import ValidationError
 from pydantic import Field as PydanticField
 
 from .config import get_settings
-from .schemas import SearchResponse, SearchResultItem
+from .schemas import (
+    CommentCreateResult,
+    CommentData,
+    CommentReplyResult,
+    PostDetail,
+    PostSummary,
+    RecentPostsResponse,
+    SearchResponse,
+    SearchResultItem,
+)
 from .search_client import SearchClient
 
 settings = get_settings()
@@ -33,8 +42,9 @@ async def lifespan(_: FastMCP):
 app = FastMCP(
     name="openisle-mcp",
     instructions=(
-        "Use this server to search OpenIsle posts, users, tags, categories, and comments "
+        "Use this server to search OpenIsle content, reply to posts and comments with an "
-        "via the global search endpoint."
+        "authentication token, retrieve details for a specific post, and list posts created "
+        "within a recent time window."
     ),
     host=settings.host,
     port=settings.port,
@@ -87,6 +97,298 @@ async def search(
     return SearchResponse(keyword=sanitized, total=len(results), results=results)
 
 
+@app.tool(
+    name="reply_to_post",
+    description="Create a comment on a post using an authentication token.",
+    structured_output=True,
+)
+async def reply_to_post(
+    post_id: Annotated[
+        int,
+        PydanticField(ge=1, description="Identifier of the post being replied to."),
+    ],
+    token: Annotated[
+        str,
+        PydanticField(description="JWT bearer token for the user performing the reply."),
+    ],
+    content: Annotated[
+        str,
+        PydanticField(description="Markdown content of the reply."),
+    ],
+    captcha: Annotated[
+        str | None,
+        PydanticField(
+            default=None,
+            description="Optional captcha solution if the backend requires it.",
+        ),
+    ] = None,
+    ctx: Context | None = None,
+) -> CommentCreateResult:
+    """Create a comment on a post and return the backend payload."""
+
+    sanitized_content = content.strip()
+    if not sanitized_content:
+        raise ValueError("Reply content must not be empty.")
+
+    sanitized_token = token.strip()
+    if not sanitized_token:
+        raise ValueError("Authentication token must not be empty.")
+
+    sanitized_captcha = captcha.strip() if isinstance(captcha, str) else None
+
+    try:
+        raw_comment = await search_client.reply_to_post(
+            post_id,
+            sanitized_token,
+            sanitized_content,
+            sanitized_captcha,
+        )
+    except httpx.HTTPStatusError as exc:  # pragma: no cover - network errors
+        status_code = exc.response.status_code
+        if status_code == 401:
+            message = (
+                "Authentication failed while replying to post "
+                f"{post_id}. Please verify the token."
+            )
+        elif status_code == 403:
+            message = (
+                "The provided token is not authorized to reply to post "
+                f"{post_id}."
+            )
+        elif status_code == 404:
+            message = f"Post {post_id} was not found."
+        else:
+            message = (
+                "OpenIsle backend returned HTTP "
+                f"{status_code} while replying to post {post_id}."
+            )
+        if ctx is not None:
+            await ctx.error(message)
+        raise ValueError(message) from exc
+    except httpx.RequestError as exc:  # pragma: no cover - network errors
+        message = (
+            "Unable to reach OpenIsle backend comment service: "
+            f"{exc}."
+        )
+        if ctx is not None:
+            await ctx.error(message)
+        raise ValueError(message) from exc
+
+    try:
+        comment = CommentData.model_validate(raw_comment)
+    except ValidationError as exc:
+        message = "Received malformed data from the post comment endpoint."
+        if ctx is not None:
+            await ctx.error(message)
+        raise ValueError(message) from exc
+
+    if ctx is not None:
+        await ctx.info(
+            "Reply created successfully for post "
+            f"{post_id}."
+        )
+
+    return CommentCreateResult(comment=comment)
+
+
+@app.tool(
+    name="reply_to_comment",
+    description="Reply to an existing comment using an authentication token.",
+    structured_output=True,
+)
+async def reply_to_comment(
+    comment_id: Annotated[
+        int,
+        PydanticField(ge=1, description="Identifier of the comment being replied to."),
+    ],
+    token: Annotated[str, PydanticField(description="JWT bearer token for the user performing the reply.")],
+    content: Annotated[
+        str,
+        PydanticField(description="Markdown content of the reply."),
+    ],
+    captcha: Annotated[
+        str | None,
+        PydanticField(
+            default=None,
+            description="Optional captcha solution if the backend requires it.",
+        ),
+    ] = None,
+    ctx: Context | None = None,
+) -> CommentReplyResult:
+    """Create a reply for a comment and return the backend payload."""
+
+    sanitized_content = content.strip()
+    if not sanitized_content:
+        raise ValueError("Reply content must not be empty.")
+
+    sanitized_token = token.strip()
+    if not sanitized_token:
+        raise ValueError("Authentication token must not be empty.")
+
+    sanitized_captcha = captcha.strip() if isinstance(captcha, str) else None
+
+    try:
+        raw_comment = await search_client.reply_to_comment(
+            comment_id,
+            sanitized_token,
+            sanitized_content,
+            sanitized_captcha,
+        )
+    except httpx.HTTPStatusError as exc:  # pragma: no cover - network errors
+        status_code = exc.response.status_code
+        if status_code == 401:
+            message = (
+                "Authentication failed while replying to comment "
+                f"{comment_id}. Please verify the token."
+            )
+        elif status_code == 403:
+            message = (
+                "The provided token is not authorized to reply to comment "
+                f"{comment_id}."
+            )
+        else:
+            message = (
+                "OpenIsle backend returned HTTP "
+                f"{status_code} while replying to comment {comment_id}."
+            )
+        if ctx is not None:
+            await ctx.error(message)
+        raise ValueError(message) from exc
+    except httpx.RequestError as exc:  # pragma: no cover - network errors
+        message = (
+            "Unable to reach OpenIsle backend comment service: "
+            f"{exc}."
+        )
+        if ctx is not None:
+            await ctx.error(message)
+        raise ValueError(message) from exc
+
+    try:
+        comment = CommentData.model_validate(raw_comment)
+    except ValidationError as exc:
+        message = "Received malformed data from the reply comment endpoint."
+        if ctx is not None:
+            await ctx.error(message)
+        raise ValueError(message) from exc
+
+    if ctx is not None:
+        await ctx.info(
+            "Reply created successfully for comment "
+            f"{comment_id}."
+        )
+
+    return CommentReplyResult(comment=comment)
+
+
+@app.tool(
+    name="recent_posts",
+    description="Retrieve posts created in the last N minutes.",
+    structured_output=True,
+)
+async def recent_posts(
+    minutes: Annotated[
+        int,
+        PydanticField(gt=0, le=1440, description="Time window in minutes to search for new posts."),
+    ],
+    ctx: Context | None = None,
+) -> RecentPostsResponse:
+    """Fetch recent posts from the backend and return structured data."""
+
+    try:
+        raw_posts = await search_client.recent_posts(minutes)
+    except httpx.HTTPStatusError as exc:  # pragma: no cover - network errors
+        message = (
+            "OpenIsle backend returned HTTP "
+            f"{exc.response.status_code} while fetching recent posts for the last {minutes} minutes."
+        )
+        if ctx is not None:
+            await ctx.error(message)
+        raise ValueError(message) from exc
+    except httpx.RequestError as exc:  # pragma: no cover - network errors
+        message = f"Unable to reach OpenIsle backend recent posts service: {exc}."
+        if ctx is not None:
+            await ctx.error(message)
+        raise ValueError(message) from exc
+
+    try:
+        posts = [PostSummary.model_validate(entry) for entry in raw_posts]
+    except ValidationError as exc:
+        message = "Received malformed data from the recent posts endpoint."
+        if ctx is not None:
+            await ctx.error(message)
+        raise ValueError(message) from exc
+
+    if ctx is not None:
+        await ctx.info(
+            f"Found {len(posts)} posts created within the last {minutes} minutes."
+        )
+
+    return RecentPostsResponse(minutes=minutes, total=len(posts), posts=posts)
+
+
+@app.tool(
+    name="get_post",
+    description="Retrieve detailed information for a single post.",
+    structured_output=True,
+)
+async def get_post(
+    post_id: Annotated[
+        int,
+        PydanticField(ge=1, description="Identifier of the post to retrieve."),
+    ],
+    token: Annotated[
+        str | None,
+        PydanticField(
+            default=None,
+            description="Optional JWT bearer token to view the post as an authenticated user.",
+        ),
+    ] = None,
+    ctx: Context | None = None,
+) -> PostDetail:
+    """Fetch post details from the backend and validate the response."""
+
+    sanitized_token = token.strip() if isinstance(token, str) else None
+    if sanitized_token == "":
+        sanitized_token = None
+
+    try:
+        raw_post = await search_client.get_post(post_id, sanitized_token)
+    except httpx.HTTPStatusError as exc:  # pragma: no cover - network errors
+        status_code = exc.response.status_code
+        if status_code == 404:
+            message = f"Post {post_id} was not found."
+        elif status_code == 401:
+            message = "Authentication failed while retrieving the post."
+        elif status_code == 403:
+            message = "The provided token is not authorized to view this post."
+        else:
+            message = (
+                "OpenIsle backend returned HTTP "
+                f"{status_code} while retrieving post {post_id}."
+            )
+        if ctx is not None:
+            await ctx.error(message)
+        raise ValueError(message) from exc
+    except httpx.RequestError as exc:  # pragma: no cover - network errors
+        message = f"Unable to reach OpenIsle backend post service: {exc}."
+        if ctx is not None:
+            await ctx.error(message)
+        raise ValueError(message) from exc
+
+    try:
+        post = PostDetail.model_validate(raw_post)
+    except ValidationError as exc:
+        message = "Received malformed data from the post detail endpoint."
+        if ctx is not None:
+            await ctx.error(message)
+        raise ValueError(message) from exc
+
+    if ctx is not None:
+        await ctx.info(f"Retrieved post {post_id} successfully.")
+
+    return post
+
+
 def main() -> None:
     """Run the MCP server using the configured transport."""