Function build_snippet_response

src/mcp/mcp.c:8479–8599

}

static char *build_snippet_response(cbm_mcp_server_t *srv, cbm_node_t *node,
                                    const char *match_method, bool include_neighbors,
                                    cbm_node_t *alternatives, int alt_count) {
    char *root_path = get_project_root(srv, node->project);

    int start = node->start_line > 0 ? node->start_line : SKIP_ONE;
    int end = node->end_line > start ? node->end_line : start + SNIPPET_DEFAULT_LINES;
    /* Context-bomb guard: a structural node (Module/File) spans its whole file,
     * so an unclipped read returned the ENTIRE source — a field-eval agent that
     * fell back to a Module snippet pulled 400KB in one call. Cap the line span
     * (far above any real function) and flag it; the exact range is still in
     * start_line/end_line for a targeted re-read. */
    bool snippet_clipped = false;
    if (end - start + 1 > MCP_SNIPPET_MAX_LINES) {
        end = start + MCP_SNIPPET_MAX_LINES - 1;
        snippet_clipped = true;
    }
    char *abs_path = NULL;
    char *source = resolve_snippet_source(root_path, node->file_path, start, end, &abs_path);

    yyjson_mut_doc *doc = yyjson_mut_doc_new(NULL);
    yyjson_mut_val *root_obj = yyjson_mut_obj(doc);
    yyjson_mut_doc_set_root(doc, root_obj);

    yyjson_mut_obj_add_str(doc, root_obj, "name", node->name ? node->name : "");
    yyjson_mut_obj_add_str(doc, root_obj, "qualified_name",
                           node->qualified_name ? node->qualified_name : "");
    yyjson_mut_obj_add_str(doc, root_obj, "label", node->label ? node->label : "");

    const char *display_path = "";
    if (abs_path) {
        display_path = abs_path;
    } else if (node->file_path) {
        display_path = node->file_path;
    }
    yyjson_mut_obj_add_str(doc, root_obj, "file_path", display_path);
    yyjson_mut_obj_add_int(doc, root_obj, "start_line", start);
    yyjson_mut_obj_add_int(doc, root_obj, "end_line", end);
    if (snippet_clipped) {
        yyjson_mut_obj_add_bool(doc, root_obj, "source_clipped", true);
        yyjson_mut_obj_add_int(doc, root_obj, "clipped_at_lines", MCP_SNIPPET_MAX_LINES);
    }

    if (source) {
        char *safe_source = sanitize_utf8_lossy(source);
        if (safe_source) {
            yyjson_mut_obj_add_strcpy(doc, root_obj, "source", safe_source);
            free(safe_source);
        } else {
            yyjson_mut_obj_add_str(doc, root_obj, "source", "(source not available)");
        }
    } else {
        yyjson_mut_obj_add_str(doc, root_obj, "source", "(source not available)");
    }

    /* match_method — omitted for exact matches */
    if (match_method) {
        yyjson_mut_obj_add_str(doc, root_obj, "match_method", match_method);